_1501265458.jpg "One dead in knife attack in Hamburg supermarket, motive unclear")
"We have no clear information as to the motive or the number of wounded," Hamburg police said in a tweet. "It was definitely a lone attacker." They said initial reports about a possible robbery had not been substantiated.
Police said passersby tackled the man after he fled the scene, injuring him slightly, before plain clothes police officers could take him into custody.
Police have been on high alert in Germany since a spate of attacks on civilians last year, including a December attack on a Berlin Christmas market, when a hijacked truck plougher into the crowds, killing 12 and injuring many more.
Security has been a campaign issue ahead of Sept. 24 parliamentary elections, in which Chancellor Angela Merkel is expected to win a fourth term in office.
Newspaper Bild showed a picture of the alleged Hamburg attacker sitting in the back of a police car, his face concealed with a bloodied shroud.
A video on its website showed a helicopter landed outside the supermarket with armed police in body armor patrolling the neighborhood.
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