Bullet holes in the window of the Embassy of Saudi Arabia are pictured after unidentified assailants sprayed it with gunfire, in The Hague, Netherlands November 12, 2020. REUTERS/Piroschka van de Wouw

A bullet hole in the window of the Embassy of Saudi Arabia is pictured after unidentified assailants sprayed it with gunfire, in The Hague, Netherlands November 12, 2020. REUTERS/Piroschka van de Wouw

Police officers stand near the Embassy of Saudi Arabia after unidentified assailants sprayed it with gunfire, in The Hague, Netherlands November 12, 2020. REUTERS/Piroschka van de Wouw

A damaged door glass is pictured after unidentified assailants sprayed the Embassy of Saudi Arabia with gunfire, in The Hague, Netherlands November 12, 2020. REUTERS/Piroschka van de Wouw TPX IMAGES OF THE DAY

The exterior of the Embassy of Saudi Arabia is pictured after unidentified assailants sprayed it with gunfire, in The Hague, Netherlands November 12, 2020. REUTERS/Piroschka van de Wouw

The exterior of the Embassy of Saudi Arabia is pictured after unidentified assailants sprayed it with gunfire, in The Hague, Netherlands November 12, 2020. REUTERS/Piroschka van de Wouw

A house where a suspect was arrested by police is seen after gunfire in central Vienna, in St. Poelten, Austria November 3, 2020. REUTERS/Lisi Niesner

A house where a suspect was arrested by police is seen after gunfire in central Vienna, in St. Poelten, Austria November 3, 2020. REUTERS/Lisi Niesner

A house where a suspect was arrested by police is seen after gunfire in central Vienna, in St. Poelten, Austria November 3, 2020. REUTERS/Lisi Niesner

Police officers walk at the site of wreath laying ceremony after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers walk after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

People prepare the place of wreath laying ceremony after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

A police officer with a dog check the place of wreath laying ceremony after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Austria's President Alexander Van der Bellen arrives to hold a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's President Alexander Van der Bellen holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's President Alexander Van der Bellen holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's President Alexander Van der Bellen holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's President Alexander Van der Bellen holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesnert

Austria's President Alexander Van der Bellen holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's Chancellor Sebastian Kurz holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's Chancellor Sebastian Kurz adjusts his face mask as he holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's Chancellor Sebastian Kurz holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's Chancellor Sebastian Kurz holds a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Austria's Chancellor Sebastian Kurz arrives to hold a news conference after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Police officers are seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police cars are seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers walk after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Forensic officers work after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Rabbi Schlomo Hofmeister is seen near the synagogue after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Rabbi Schlomo Hofmeister walks near the synagogue after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

A crime forensic works near the synagogue after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

A crime forensic works near the synagogue after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

Police officers walk after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Damage is seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

A cameraman films the area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officer stands guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officer walks after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

A police line is seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

A police line is seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

A police officer walks as he holds a weapon after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

A secured area is seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Lisi Niesner

A secured street is seen after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

A police officer stands guard in fornt of a secured area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police vehicles block a street after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Leonhard Foeger

Police officers block a street after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officers block a street after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officers block a street after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

A Fire Department vehicle passes by as police officers secure an area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officers stand guard after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officers secure an area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Members of Vienna's Fire Brigade search in an area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Police officers secure an area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa

Members of Vienna's Fire Brigade gather in an area after exchanges of gunfire in Vienna, Austria November 3, 2020. REUTERS/Radovan Stoklasa