A cadaver dog named Echo searches for human remains in a van destroyed by the Camp Fire in Paradise, California, U.S., November 14, 2018. REUTERS/Terray Sylvester

A Guinness truck passes a sign for Customs and Excise on a road near the border with Ireland near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

A Guinness truck passes a sign for Customs and Excise on a road near the border with Ireland near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

A sign for Customs and Excise is seen on a road near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

A sign for Customs and Excise is seen on a road near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

A sign for Customs and Excise is seen on a road near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

A sign for Customs and Excise is seen on a road near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

A sign for Customs and Excise is seen on a road near Kileen, Northern Ireland, October 17, 2018. REUTERS/Clodagh Kilcoyne

Signage from an old border customs and excise hut is seen in the border village of Glenfarne, Ireland, February 21, 2018. Picture taken February 21, 2018. REUTERS/Clodagh Kilcoyne

Signage from an old border customs and excise hut is seen in the border village of Glenfarne, Ireland, February 21, 2018. Picture taken February 21, 2018. REUTERS/Clodagh Kilcoyne

Signage from an old border customs and excise hut is seen in the border village of Glenfarne, Ireland, February 21, 2018. Picture taken February 21, 2018. REUTERS/Clodagh Kilcoyne

Signage from an old border customs and excise hut is seen in the border village of Glenfarne, Ireland, February 21, 2018. Picture taken February 21, 2018. REUTERS/Clodagh Kilcoyne

A German customs officer stops a taxi during a raid looking for illegal workers in restaurants, at constructions sites and in the logistics sector in Cologne, Germany September 11, 2018. REUTERS/Wolfgang Rattay

A disused Great Northern Railway line and station that was for customs and excise on the border town of Glenfarne, Ireland, February 21, 2018. REUTERS/Clodagh Kilcoyne SEARCH "KILCOYNE BORDER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

An old British postbox, painted green, stands at a disused railway station and Great Northern railway line that was for Customs and Excise on the border town of Glenfarne, Ireland, February 21, 2018. REUTERS/Clodagh Kilcoyne SEARCH "KILCOYNE BORDER" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A sign for customs and excise is seen on the motorway approaching the border between Northern Ireland and Ireland, near Newry, Northern Ireland July 13, 2017. REUTERS/Clodagh Kilcoyne

A sign for customs and excise is seen on the motorway approaching the border between Northern Ireland and Ireland, near Newry, Northern Ireland July 13, 2017. REUTERS/Clodagh Kilcoyne

A police vehicle stops traffic beside a sign for customs and excise on the motorway approaching the border between Northern Ireland and Ireland, near Newry, Northern Ireland July 13, 2017. REUTERS/Clodagh Kilcoyne

A police vehicle stops traffic beside a sign for customs and excise on the motorway approaching the border between Northern Ireland and Ireland, near Newry, Northern Ireland July 13, 2017. REUTERS/Clodagh Kilcoyne

A police vehicle stops traffic beside a sign for customs and excise on the motorway approaching the border between Northern Ireland and Ireland, near Newry, Northern Ireland July 13, 2017. REUTERS/Clodagh Kilcoyne

Customs and Excise Department officials (L-R), Endangered Species Protection Officer Timothy Lam, Ports Control Group Head Chan Wan-hung and Special Investigation Group Head Wan Hing-chuen, attend a news conference with seized ivory tusks in Hong Kong, China July 6, 2017. REUTERS/Bobby Yip

Custom officials hold up seized pangolin scales at Kuala Lumpur airport customs complex in Sepang May 8, 2017. REUTERS/Rozanna Latiff

Roy Tang (2L), Commissioner of the Customs and Excise Department, speaks during a news conference in Hong Kong, China January 25, 2017. REUTERS/Bobby Yip

Roy Tang, Commissioner of the Customs and Excise Department, attends a news conference in Hong Kong, China January 25, 2017. REUTERS/Bobby Yip TPX IMAGES OF THE DAY

Customs officers stand next to a stuffed lion in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY

A customs officer stands in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Customs officers stand in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Customs officers stand in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

A customs officer stands in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Customs officers stand in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

A customs officer stands in front of a stuffed leopard in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

A customs officer stands in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY

Customs officers stand next to stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Customs officers stand next to stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Customs officers stand next to a stuffed lion in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

A customs officer looks at stuffed leopards displayed in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Customs officers stand in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY

Customs officers stand in front of stuffed leopards in a taxidermy hall as part of a fight against the trafficking of protected species at the Museum of Natural History in Paris, France, February 16, 2016. French customs, who seized seven stuffed animals in 2015, deliver them to the museum for their collections. REUTERS/Philippe Wojazer

Policemen guide a vehicle transporting South Korean employees working at the KIC (Kaesong industrial complex) as they return from KIC on the Grand Unification Bridge, just south of the demilitarized zone separating the two Koreas in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

Policemen guide a vehicle transporting South Korean employees working at the KIC (Kaesong industrial complex) as they return from KIC on the Grand Unification Bridge, just south of the demilitarized zone separating the two Koreas in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

Workers unload products made in Kaesong Industrial Complex (KIC) after returning from KIC near the demilitarized zone separating the two Koreas in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A journalist work at a checkpoint on the Grand Unification Bridge which leads to Kaesong Industrial Complex (KIC) in North Korea, just south of the demilitarized zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

Workers unload products made in Kaesong Industrial Complex (KIC) after returning from KIC near the demilitarized zone separating the two Koreas in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

Workers unload products made in Kaesong Industrial Complex (KIC) after returning from KIC near the demilitarized zone separating the two Koreas in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A South Korean security guard stands guard on an empty road which leads to the Kaesong Industrial Complex (KIC) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. The Korean characters on the gateway reads "Inter-Korean Transit Office". REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY

South Korean soldiers stand guard at a gateway which leads to the Kaesong Industrial Complex (KIC) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

South Korean officials check a vehicle carrying a products made in the Kaesong Industrial Complex (KIC) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

South Korean soldiers stand guard at a gateway which leads to the Kaesong Industrial Complex (KIC) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A South Korean employee working at North Korea's Kaesong Industrial Complex (KIC) is surrounded by media at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A security guard stands guard at a gateway which leads to the Kaesong Industrial Complex (KCI) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A security guard directs traffic as South Korean vehicles transporting employees working at North Korea's Kaesong Industrial Complex (KIC) pass a gateway which leads to the Kaesong Industrial Complex (KCI) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A security guard directs traffic as South Korean vehicles transporting employees working at North Korea's Kaesong Industrial Complex (KIC) pass a gateway which leads to the Kaesong Industrial Complex (KCI) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A security guard directs traffic as South Korean vehicles transporting employees working at North Korea's Kaesong Industrial Complex (KIC) pass a gateway which leads to the Kaesong Industrial Complex (KCI) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A South Korean soldier stands guard at a checkpoint on the Grand Unification Bridge which leads to the inter-Korean Kaesong Industrial Complex in North Korea, just south of the demilitarized zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A South Korean soldier sets up a barricade at a checkpoint on the Grand Unification Bridge which leads to the inter-Korean Kaesong Industrial Complex in North Korea, just south of the demilitarized zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

South Korean soldiers stand guard at a gateway which leads to the Kaesong Industrial Complex (KCI) at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarised zone separating the two Koreas, in Paju, South Korea, February 11, 2016. REUTERS/Kim Hong-Ji

A Canadian customs building is seen from the United States Border Station Port of Willow Creek on the international border in Montana, United States, November 20, 2015. Picture taken on November 20, 2015.REUTERS/Lucy Nicholson

The U.S. and Canadian customs buildings are seen on the international border near Havre, Montana, United States, November 20, 2015. Picture taken on November 20, 2015. REUTERS/Lucy Nicholson

A vandalised windshield is pictured on a petrol tanker parked at customs at the Nepalese-Indian border during general strike called by Madhesi protesters demonstrating against the new constitution in Birgunj, Nepal November 5, 2015. Nepal has faced an acute fuel crisis for more than a month since protesters in the lowland south, angered that a new constitution fails to reflect their interests, prevented supply trucks from entering from India. Many in Nepal see India's hand in the protests although it denies any role. REUTERS/Navesh Chitrakar

Chinese tourists shop in the Everrich duty free shopping mall in Kinmen county, Taiwan, September 8, 2015. Rustic Kinmen, with a population of less than 129,000, is a half-hour ferry ride to China, but it takes an hour to fly to major Taiwan cities. Just off its shores, glass-walled high-rises wink seductively from the booming mainland port of Xiamen in one of China's most prosperous provinces. Kinmen is eyeing closer commercial ties with China. It wants to pipe water from Xiamen and has plans to build a bridge and set up a glittering free trade zone with the city. China is seeking unification with Taiwan under its "one country, two systems" formula by which Hong Kong, a former British colony, returned to Chinese rule in 1997. And Kinmen, or "Golden Gate", is a test for China's ambitions to recover Taiwan through soft power. Picture taken September 8, 2015. REUTERS/Pichi Chuang