neighbor erica gaspari said she reported him to police for recruiting children. >> they say to me because the kids need to be safe. safe from what? from this world. this world of what? >> reporter: on saturday, neighbor ken chigbo says he approached him asking about a moving van he was renting. >> asking how much. yeah, it wasn't until now it starts sinking in really. >> reporter: and michael mimbo says after the attack, realized the possible significance of a white van he had seen speeding away from their apartment complex on saturday. is it upsetting, disturbing, troubling? >> yeah, especially if it's something that you knew, someone that you commonly said hello to. it's really hard to believe, but then all the evidence are there. >> reporter: the 12 people arrested at that complex have now been released. but tonight british media reports a dozen molotov cocktails were found in the back of the attackers' van. and scott, police are still trying to figure out if the three men had help from anyone else. >> anna werner in our london newsroom tonight. anna, thank you. and we're back in just

neighbor erica gaspari said she reported him to police for reporting children. >> he said to me, "becauseids need to be saved." saved from what? from this world. >> reporter: on saturday, neighbor says abs approached him, asking about a rented moving van he was using. -he started asking questions, how much, this, that, and the other. it wasn't until now that it starts sinking in really. >> reporter: and michael mimbo says after the attack, he realized the possible significance of a white van he'd seen speeding away from their apartment complex on saturday. is it upsetting? disturbing? troubling? >> yeah, especially if it's someone you knew, someone that, you know, you said hello. to it's really hard to believe, but then all the evidence is there. >> reporter: the 12 people arrested at that complex have now been released, but tonight british media reports a dozen molotov cocktails were found in the back of the attackers' van, and, scott, police are still trying to figure out if those three men had help from anyone else. >> pelly: anna werner in our london newsroom tonight. anna, thank you.