3 Dead, Including 8-Year-Old Boy, In Explosions At Boston Marathon

Two explosions at the finish line of the Boston Marathon have resulted in at least three deaths and more than 140 injuries, according to CBS News.

It happened around 1:50 p.m. Central Time outside Marathon Sports on Boylston Street where thousands of spectators were watching the race and runners were completing the course.

One blast detonated right at the finish line and another, a few seconds later, about a block away.

Law enforcement authorities say the two blasts were from bombs placed in trash cans near the finish line. At least one other intact bomb was also found, authorities report.

CBS News senior correspondent John Miller reports that a Saudi national is being questioned by authorities. He was seen "acting suspiciously" running from the explosion, and a civilian chased him down and tackled him. He was turned over to Boston police and is being questioned by the FBI. He is being cooperative and denies any involvement.

"This could mean a lot, or this could mean very little," Miller said. "It's too soon to call him a suspect."

Miller reported earlier that authorities are also reviewing surveillance video that shows a man from behind carrying two backpacks near the site of the explosions. Authorities are not sure whether the subject in the video is linked to the blasts.

Boston police say no suspect has been taken into custody.

There was no word on the motive or who may have launched the attack, and authorities in Washington said there was no immediate claim of responsibility.

Ron Winn from Tulsa had just finished running the Boston Marathon when he heard the first explosion.

"I didn't really think anything of it, then the second one went off. It's just shocking." Winn said he was walking into his hotel, which is right at the finish line.

Winn, 65, was not injured and said everyone in his group is fine. Now he is watching the coverage on television.

"I'm just thankful I'm okay. I know a lot of people aren't," he said.

Eighty-six Oklahomans were registered in the race. If you know the name of people entered in the race, you can search for their names at the Boston Marathon web site to see when they finished.

A third incident at the John F. Kennedy Library a few miles away and more than an hour later was initially believed to be another explosive device, but library and police officials later said it was an unrelated fire. No one was injured.

Boston Police Commissioner Edward Davis asked people to stay indoors or go back to their hotel rooms and avoid crowds as bomb squads checked parcels and bags left along the race route.

The Federal Aviation Administration barred low-flying aircraft from within 3.5 miles of the site.

Runners who had not finished the race were diverted straight down Commonwealth Avenue and into a family meeting area, according to an emergency plan that had been in place.

The Boston Marathon honored the victims of the Newtown, Conn., shooting with a special mile marker in Monday's race.

Boston Athletic Association president Joanne Flaminio previously said there was "special significance" to the fact that the race is 26.2 miles long and 26 people died at Sandy Hook Elementary School.

The Associated Press contributed to this story.