"The current state of our investigations points to the threat being exclusively at the shopping center", said the police in a statement seen by Reuters.
German police sealed off and closed a shopping mall in the heart of the western city of Essen on Saturday after the security services warned of a possible terrorist attack. Police officers and vans surrounded the mall - one of the biggest in Germany - Saturday afternoon, Reuters reported. According to an official police Twitter account, police also boosted their numbers in the city's main train station, although trains were still running.
Two men in the nearby town of Oberhausen were arrested in connection with the threat.
Police have ordered a German shopping centre after receiving tip-offs about an imminent terror attack.
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"Police have concrete indications of a possible attack".
The Associated Press reported that around a hundred police officers - many armed with machine pistols and bullet-proof vests - positioned themselves around the shopping centre and adjacent auto park to prevent anyone from entering.
Twelve people were killed and 48 others injured in December after a tractor-trailer plowed through a busy outdoor Christmas market in Berlin.
Germany has been on the edge following a series of attacks in public places over the past year. The suspect, a Tunisian man, was shot dead by police days after the attack, which ISIS claimed it inspired.