This is what we know here in Boston. (I have a family member who works at the Prudential building in Boston and a friend of the family who works two blocks away, thankfully neither were working there today.
A) 2 dead, nearly 100 injured (8 year old one of the dead)'
B) Area is still under lockdown
C) They are looking for a man spotted on surveillance carrying multiple backpacks and apparently placing one of them in a garbage can near the explosion site
D) A saudi national is being questioned by FBI after being spotted being suspicious and running from the explosion. FBI is saying saudi has been cooperative and is denying any link
E) about a 20 block or so area in Boston is still locked down as they try to find more devices (four so far, two exploded, one in a hotel near Copley Square, one in an unknown location)