Police have found an unexploded device and will have a controlled explosion within one minute near 600 Boylston across from the Boston Public Library.
Emerson College is on lockdown
Boston Police are sending marathoners who hadn't finished the course to the Common.
Many Twitter users are using the hashtag #prayforboston now on Twitter to express their shock and disbelief.
CNN reporting 2 dead and 28 injured now. It may be hours before we have an exact toll.