Breaking News: At least 2 dead, 28 injured from explosions at Boston Marathon

Two bombs struck at the finish line of the Boston Marathon today at about 3 p.m., killing two people and injuring at least 28, according to various news reports.

CNN reports authorities in Boston have found other explosive devices that they were working to dismantle. There are no credible claims of responsibility for the explosions yet.

A trauma nurse from Massachusetts General Hospital told ABC News medical workers had "set up a temporary morgue at a medical tent at the road race and were treating patients with severed limbs and children with severe burns."

Mass General also said it was treating 19 injured people, almost all in critical condition, according to CNN. Tufts Medical Center reported it was treating nine people, bringing the total number of people injured to 28. More than 26,000 people were registered for today's marathon.

NBC Sports Network tweeted that marathon runners have crossed the finish line and continued running straight to Mass General to donate blood.

Hospitals are continuously reporting injuries and amputations. ABC just reported that doctors at Mass General are performing multiple amputations and Boston-area hospitals are calling for walk-in blood donations beginning at 7 a.m. tomorrow.

Check back with us soon for more in-depth coverage.