I personally can't see the Palestinians pulling this off - I mean, this is a huge step up from suicide bombs. This is either a state-backed assault or an internal assault (i.e. by a US organisation). However, the fact that this seems to be a suicide attack makes me think of an Islamic attack.
I really don't know what to think. What an absolutely awful, awful day, and my deepest sympathies go out to all the victims, and all you Americans out there who are going to have to come to terms with this. I am so dreadfully sorry about what has happened.
I used to think the brain is the most fascinating part of my body. But, hey, who is telling me that?