you have these buses here that were abandoned in the frenzy. the whole area was locked down at the time. trains in and out of the city were cancelled and it's still cordoned off as you can see. bortd controls have been strengthed. there is an ongoing investigation that may be a threat. this attack falls into a tragic pattern we've seen here in europe. there was nice, france, berlin, germa germany. the same sort of stories from eyewitnesss as well. they didn't know what this vehicle was doing, they didn't realize it was terror, until it was too late. it doesn't feel as if we're learning anything any more. it feels routine. we have to learn to live with this. mocks foster, cnn stockholm sweden. >> max foster also reporting there from the scene. there have been several recent