>> reporter: the police say this is a continuing investigation, continuing at a swift pace. they have made significant progress inidentifying the three men in the attack. one of them rented the white van and several searches in the east of london in barking today, do seem to indicate the police suspect these men may have been living in the east of london prior to this attack. why can we surmise this? looking at what the police have done after recent attacks, the first properties they go tend to be the properties where the attackers have been living or have close friends or associates. that's where we can begin to surmise the attackers came from london, not identifying them