Two explosions have hit the Boston Marathon.

According to Boston police, two people are dead and 23 are injured.

Update 23 injuries2 dead #tweetfromthebeat via @cherylfiandaca

— Boston Police Dept. (@Boston_Police) April 15, 2013

A local TV station said the blasts occurred near the famous race's finish line.

"Witnesses said several victims lost limbs, and the area was being evacuated," WCVB reported.

AP quoted a Toronto runner who heard two explosions.

"There are people who are really, really bloody," Laura McLean said. "They were pulling them into the medical tent."

On Facebook, race organizers posted: "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."

Photo of the explosion by @globedavidlryan twitter.com/BGlobeSports/s…— Boston Globe Sports (@BGlobeSports) April 15, 2013