Special police forces prepare to search a neighboring shopping center outside the Olympia mall in Munich, Germany, on Friday.

Police officers take up positions with their weapons outside the Olympia mall in Munich, Germany, on Friday.

A police officer with a submachine gun patrols outside the Olympia mall in Munich, Germany, on Friday after at least eight people were shot dead and others were wounded.

Policemen arrive at a shopping centre in which a shooting was reported in Munich, southern Germany, Friday, July 22, 2016. Situation after a shooting in the Olympia shopping centre in Munich is unclear. (Matthias Balk/dpa via AP)

In this screen grab taken from video, police officers stand outside a McDonald's restaurant in Munich, Germany, where a gunman or gunmen opened fire on Friday.

A police officer takes up a position in downtown Munich, Germany, after a shooting was reported at a McDonald's restaurant at a mall on Friday.

In this grab taken from video, police run in the area of the Olympia Einkaufszentrum mall, after a shooting, in Munich, Germany, on Friday. A manhunt was underway for a shooter or shooters who opened fire at the mall, killing and wounding multiple people, a Munich police spokeswoman said.

Heavily armed police forces walk through the subway station Karlsplatz (Stachus) after a shooting in the Olympia shopping center was reported in Munich, Germany, on Friday.

People place their hands on their heads as they leave the Olympia mall in Munich, Germany, on Friday after several people were killed in a shooting there.

Police escort people leaving the Olympia mall in Munich, Germany, on Friday, after at least eight people were shot dead there.

People run away from the Olympia Einkaufszentrum mall after a shooting there, in Munich, Germany, on Friday. The city transit system shut down and police asked people to avoid public places.

Police officers secure the main train station after a shooting was reported in Munich, Germany, on Friday. Rail traffic was halted.

Police teams get into position at Karlsplatz (Stachus) square after a shooting in the Olympia shopping centre was reported in Munich, Germany, on Friday. Police were hunting for a shooter or shooters.

Heavily armed police officers gather outside the Olympia shopping center where multiple people were killed in a shooting in Munich, Germany, on Friday.