Two explosions near the finish line of the Boston Marathon had people carrying bloody spectators into the medical tent set up for runners, according to an Associated Press report on the Pocono Record website.
The Boston Athletic Association website lists three Westlake entrants.
"There are a lot of people down," the AP quoted one man saying. The explosions happened about three hours after the winners crossed the finish line.
According to the Associated Press, three people were killed and more than 100 others were injured.
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 continues to follow the story.
Those looking for their loved ones are asked to call 617-635-4500 or search for them on American Red Cross' Safe and Well Listings.