i'm sarah harmon. it's good to have you with us. we begin in the northern german city of hamburg where a man with a knife killed one person and injured six others in an attack at a supermarket. police have arrestedfrom the united arab immigrants, who may say was tackled that passersby while attempting to flee the scene. no motive has been revealed, but police say the suspect was acting alone. the attack place in a hamburg district near the suspect had ties to germany's salafist seen -- scene. let's cross over to thomas. he is monitoring the situation for us. what more do we know about the incident? >> the police have confirmed the main suspect was, as you mentioned, a man from the united arab immigrants, although they are still trying to find more details about his citizenship. it is a 26-year-old man. there's also more information on victims. the man that died, a 50-year-old german. there are six people injured. according to police, the injuries are very serious. we still do not know the motive behind this incident. police investig