Police in the German city of Munich say the perpetrators of a shooting attack are still on the run, and they advise people to avoid public places, BBC reported.
There are reports of at least six people killed, but police have not confirmed that figure.
A big security operation is under way at the Olympia shopping centre in the north-western Moosach district.
Shop workers have been unable to leave the building. There is no information about a possible motive for the attack.
The police Facebook page quoted eyewitnesses as saying they had seen three attackers carrying guns.
Police are now describing it as "an acute terror situation". They say the first reports of a shooting came in just before 18:00 (16:00 GMT).
Public transport has been suspended as the extensive security operation continues. The city's central railway station has been evacuated.
Police helicopters are flying over the city and special forces are involved in the massive police deployment.
Bavarian public radio reports that an elite border security unit, GSG9, is heading for Munich with several helicopters.
Bavarian Prime Minister Horst Seehofer is holding a crisis meeting with security advisers.
The security forces have been on alert after a teenage migrant stabbed and injured five people on a train in Bavaria on Monday in an attack claimed by so-called Islamic State.
The authorities had warned of the danger of further incidents.
A man working at a petrol station in Munich told the BBC: "We see just ambulances and it's like firemen and police but all this area is evacuated, all the streets.
"Now [there] are no cars just on the side of the streets. All of the streets are blocked. I see that the people are scared. Everybody are running around."
Munich police said they did not know where "the perpetrators" were. "Look after yourselves and avoid public places".