Fighters loyal to Libya's U.N.-backed government (GNA) fire weapons during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) fires an AK-47 during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) drives in a damage pickup truck during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) shouts during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) fires a RPG during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

Fighters loyal to Libya's U.N.-backed government (GNA) walk during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) fires a weapon during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

Fighters loyal to Libya's U.N.-backed government (GNA) take cover during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) shouts during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libya's U.N.-backed government (GNA) gestures during a clash with forces loyal to Khalifa Haftar at the outskirts of Tripoli, Libya May 21, 2019. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognized government walk inside a building at outskirts of Tripoli, Libya, May 16. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognized government fires a 105 mm cannon at forces loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

A member of the Libyan internationally recognized government forces operates a drone at outskirts of Tripoli, Libya, May 11. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognized government fires a heavy machine gun during clashes with forces loyal to Khalifa Haftar at outskirts of Tripoli, Libya, May 16. REUTERS/Goran Tomasevic 

A member of the Libyan internationally recognized government forces jumps from a wall after he fired a rifle on the outskirts of Tripoli, Libya, May 12. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognized government walks inside a house near position of fighters loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognised government fires a AK-47 during clashes with forces loyal to Khalifa Haftar at outskirts of Tripoli, Libya May 16, 2019. REUTERS/Goran Tomasevic 

A member of the Libyan internationally recognized government fires a rifle as other fighter takes a rest at outskirts of Tripoli, Libya, May 12. REUTERS/Goran Tomasevic 

A member of the Libyan internationally recognized government holds a RPG as he sits on top of a building at outskirts of Tripoli, Libya, May 12. REUTERS/Goran Tomasevic 

Fighters loyal to Libyan internationally recognized government walk on the frontline outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognized government gestures during clashes with forces loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

Fighters loyal to Libyan internationally recognized government jump over the wall during clashes with forces loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

Fighters loyal to Libyan internationally recognised government fire guns at forces loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognised government looks at forces loyal to Khalifa Haftar positions outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

A fighter loyal to Libyan internationally recognised government looks at fighters positions loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic 

Fighters loyal to Libyan internationally recognised government look at positions of fighters loyal to Khalifa Haftar outside Tripoli, Libya, May 15. REUTERS/Goran Tomasevic