Boston police confirm two dead and 22 injured, according to Cheryl Fiandaca, head of media relations for the Boston police.
-- The Boston Marathon Facebook page says: "There were two bombs that exploded near the finish line in today's Boston Marathon. We are working with law enforcement to understand what exactly has happened."
-- Injured people are being treated in medical tents that had been erected near the marathon finish line to treat exhausted runners. Other injured are being taken to the several hospitals that are within two miles.
-- A Massachusetts General Hospital spokeswoman tells CNN there are 19 injured at the hospital as of 4 p.m. No word on their condition.
-- Nine patients from the explosion were at Tufts Medical Center as of 4:10 p.m., according to spokesman Jeremy Leachan. No word on their conditions.
-- There were no credible security threats ahead of the Boston Marathon, according to a state government official.
-- All off-duty Boston police officers have been ordered to report to their districts, WHDH TV reported.
-- More than 400 Massachusetts National Guard troops were already on duty, assigned to help local police keep the marathon route clear for runners.
-- The Massachusetts Emergency Management Agency activated a Red Cross website to help people who might have been near the explosions but are unable to make a phone call check in with friends and family.
-- Metropolitan Police in Washington D.C. are at a heightened level of security, according to D.C. police Public Affairs Specialist Saray Leon.
-- New York City and San Francisco police have been placed on a heightened state of alert.