Boston Marathon Explosion: University City Runners Were There

4 p.m. Update:

NPR is reporting that two people have died and at least 23 are injured. The Associated Press reports two more explosive devices have been detected. 

Our original story:

Explosions near the finish line of the Boston Marathon had people carrying bloody spectators into the medical tent set up for runners, reports Back Bay Patch in Massachusetts.

"There are a lot of people down," the Associated Press quoted one man saying. The explosions happened about three hours after the winners crossed the finish line. 

The Boston Athletic Association website lists the following University City entrants:

• Ryan Gasser
• Daniel Muntges
• Jeffrey Zacks

Patch currently has no information on these runners, but will update this story as we learn more information. If you're able to share information about these runners with the community, please let us know in the comments or email editor Ryan Martin at ryan.martin@patch.com. 

Reuters is reporting there are no indication how may people are injured, according to a story on the Chicago Tribune website, which also said the explosions happened as people were cheering on those still completing the race.

NBC News reported fire engines, police and emergency medical personnel were headed to the scene. An affiliate reporter told NBC News she heard two loud explosions, and that "everybody kind of ducked and hit the ground," and Jackie Bruno, reporter for New England Cable News said she saw people with significant injuries, including one person with a leg blown off.

"Runners were coming in and saw unspeakable horror," Bruno said.  

Patch is following this breaking story.