injured after a van ran over muslim worshippers outside a north london mosque. the incident now being treated as an act of terrorism. look at the pictures of the aftermath after midnight london time. witnesses describing a chaotic scene with people screaming for help from police and medics. at least one person has been arrested. a 48-year-old man described as the driver of the van. he was detained at the scene by members of the public. >> authorities are not saying if muslims were specifically targeted. we'll get the latest developments from cnn's phil black in london. where do we stand on this investigation? >> reporter: the police are saying that this bears all the hallmarks of recent terror attacks because once again a car has been used as a weapon. what they're not sure of or not being definitive on yet is the motive. it is beginning to look pretty clear. it was just after midnight. that's when the white van came down the road behind me. and witnesses say it swerved and