much. pamela brown now joins us with information from her sources. counterterrorism officials in the u.s. are busy trying to piece together what happened here. and they are alarmed by the apparent meth appare apparent methodology. there are tactics from various terror groups. so it s a bit of a guessing game as to who could be behind this. but i will tell you, this is what law enforcement officials have been concerned about for a while. there are people in europe who may travel to syria and iraq and get training. and officials say it appears the people involved with this had