4 Los Al/Seal Beach Runners in Boston Marathon, Site of Deadly Explosions

One Seal Beach resident and three Los Alamitos runners competed in the Boston Marathon on Monday,  with most finishing before explosions reportedly claimed the lives of at least two people and injured more than 100 near the finish line.

Click here for the latest on the Boston Marathon explosions.

Dozens of Orange County residents took part in the race, including Laguna Beach's John Loftus, who won the age 54-59 division. Most of the Orange County runners finished the race before the explosions, according to a race website. There was no immediate word on whether any were injured by the explosion.

Closer to home, the Orange County Sheriff's Department promised to step up patrols "at local sporting/entertainment venues and other large gathering places."

Several gruesome photos have surfaced on Twitter from reporters and runners who said they were at the scene, some appearing to show individuals missing limbs and blood splattered across the sidewalk.

According to the Boston Athletic Association site, this Seal Beach runner finished well before the blasts:

• Alyssa Caro, 26: 3 hours, 13 minutes, 29 seconds

According to the Boston Athletic Association site, these two Los Alamitos entrants finished well before the blasts and one did not finish:

• Diane Burgin, age 52: 3 hours, 23 minutes, 30 seconds
• Randy Parker, age 51, : 3 hours, 28 minutes, 39 seconds
• Susan Singer, age 52

These marks are “gun times,” not the actual times from start to finish, since many thousands of entrants don’t reach the starting line until minutes after the gun goes off.

Boston Backbay Patch is covering story.

Patch will provide updates.