Update 9:40 pm - BOSTON (AP) — A former Army medic says the scene at today's Boston Marathon was "more like Baghdad and Bombay than Boston."

Bruce Mendelsohn was attending a post-race party in an office building just above the blast site when an explosion knocked him to the floor. He rushed outside and found blood, glass and debris everywhere, and began applying pressure to what he calls "gruesome" wounds.

One of the runners describes a gruesome scene inside a medical tent near the finish line, as bombing victims were brought in "with no limbs." He says he tried to shield his children's eyes, but says "they saw a lot."

Three people were killed and more than 140 injured, including 17 critically, when two bombs exploded almost simultaneously about 100 yards apart.

There's no word on who may have carried out the attack or why.

Update 6:55 pm – Investigators have confirmed that three people have died in the bombings in Boston.

Massachusetts Governor Deval Patrick says federal, state and local law enforcement agencies continue their investigation into Monday’s deadly bombing near the finish line of the Boston Marathon. He says the National Guard has secured the area where the bombings occurred, and the investigation is now being handled by the FBI.

Gov. Patrick says the city of Boston will operate under heightened security measures in the near future as the investigation continues. He is urging everyone to report any suspicious items or activities.

FBI Special Agent In Charge Rick Deloria says the probe is a “potential terrorism” investigation. He adds that “substantial” federal resources will be brought in to investigate the bombings.

Officials say there “is no suspect” at a Boston hospital, as some outlets had reported.

Update: 6:10pm - BOSTON (AP) — Authorities say bombs that exploded near the finish line of the Boston Marathon have killed two people and injured more than 120.

Eight hospitals report that they are treating at least 124 people. Of those, at least 15 are in critical condition.

The injuries ranged from cuts and bruises to amputations. Many victims suffered lower leg injuries and shrapnel wounds. Some suffered ruptured eardrums.

Dr. Richard Wolfe, chief of the department of emergency medicine at Beth Israel Deaconess Medical Center, says one or two of the hospital's 21 patients faced a "high probability of mortality."

Update: 4:51pm: CHICAGO (AP) — Google is stepping in to help family and friends of Boston Marathon runners find their loved ones after explosions near the finish line.

The site, called Google Person Finder, allows users to enter the name of a person they're looking for or enter information about someone who is there.

Cellphone use has been difficult in the Boston area. Phone companies say service is operating, but with heavy traffic.

Far-flung family members and friends are frantically using social media to check on the safety of runners and spectators after two bombs exploded near the finish line of the marathon, killing two and injuring dozens.

Boston Marathon Explosion Map
Explosion Map (Photo: nytimes.com, click to enlarge)
loading...

UPDATE: 4:26pm: BOSTON (AP) — Boston police say no suspect has been taken into custody in connection with the explosions near the finish line of the Boston Marathon.

Police Commissioner Edward Davis also says that the fire at a library a few miles away and more than an hour later doesn't appear to be related to the explosions at the race on Monday. He says the fire may have been caused by an incendiary device.

Authorities say the blasts killed two people and injured at least 73.

Police say it's too early to get into specifics about the nature of devices or whether shrapnel was involved.

WASHINGTON (AP) —President Barack Obama, responding to the explosions at the Boston Marathon, says the United States does not know "who did this or why" but vowed that whoever is responsible "will feel the full weight of justice."

He said: "We will find out who did this and we will hold them accountable."

Obama made his remarks Monday evening from the White House about three hours after two explosions detonated near the marathon's finish line. At least two people were killed and 50 injured in the blasts.

Obama has been in touch with federal law enforcement and Massachusetts officials in the aftermath of the explosions.

The Secret Service reacted cautiously to the blasts, expanding the security perimeter around the White House.

UPDATE: 4:00pm:Boston police commissioner: JFK Library fire doesn't appear to be related to race explosions

UPDATE: 3:15pm: Boston police say there's been a third explosion in the city, following two blasts near the finish line of the Boston Marathon that killed two people and injured many others.

Police Commissioner Edward Davis says authorities aren't certain that the explosion that occurred more than an hour later at the JFK Library was related to the other blasts, but they're treating it as if it was.

Davis says there are no injuries stemming from the third explosion. The total numbers of casualties from the other blasts isn't known.

Davis urged people to stay indoors and not congregate in large groups.

Police say they received no information before the explosions to indicate they were coming.

UPDATE 3:00pm: Boston police commissioner: 3rd explosion at JFK Library

Boston police say two people were killed and more than 20 others were hurt when a pair of bombs exploded near the finish line of the Boston Marathon. The blasts shattered the end of the race today, sending authorities out on the course to carry away the injured while stragglers in the 26.2-mile race were rerouted away from the smoking site. One runner says he saw at least two dozen people with very serious injuries, including missing limbs. Competitors and race volunteers were in tears as they fled the chaos, and as bloody spectators were carried into the medical tent that had been set up to care for fatigued runners.

UPDATE 2:40pm: A senior U.S. intelligence official says two more explosive devices have been found near the scene of the Boston marathon where two bombs detonated earlier.

The official said the new devices were being dismantled.

It was not immediately clear what kind of devices had been found Monday. The official said the first two did appear to be bombs.

The official spoke on condition of anonymity because he was not authorized to discuss the findings publicly.

The official said it was not clear what the motive was or who may have launched the attack.

The Federal Aviation Administration is warning pilots that it has created a no-fly zone over the site of two explosions at the annual Boston marathon.

The agency said in a notice issued Monday about an hour after the explosions that a no-fly zone with a 3.5-mile radius has been created over 811 Boylston Street. The zone is limited to flights under 3,000 feet in altitude, which is lower than most airliners would fly except when taking off or landing.

The notice says the no-fly zone is effective immediately and will remain in effect until further notice. Pilots planning flights were urged to call their local flight service station.

UPDATE 1:45pm: Two explosions at the finish line of the Boston Marathon have resulted in injuries.

Bloody spectators were being carried Monday to the medical tent that had been set up to care for fatigued runners. Police wove through competitors as they ran back toward the course.

"There are a lot of people down," said one man, whose bib No. 17528 identified him as Frank Deruyter of North Carolina. He was not injured, but marathon workers were carrying one woman, who did not appear to be a runner, to the medical area as blood gushed from her leg. A Boston police officer was wheeled from the course with a leg injury that was bleeding.

About three hours after the winners crossed the line, there was a loud explosion on the north side of Boylston Street, just before the photo bridge that marks the finish line. Another explosion could be heard a few seconds later.

Spectators and runners are describing the twin explosions that shook the finish line of the Boston Marathon today.

One woman says she was waiting for her husband to cross the finish line, and, in her words, "it just blew." She described it as "a loud boom, and then glass everywhere." Cherie Falgoust says something hit her head, and she "just ducked."

A runner, Laura McLean of Toronto, says she heard two explosions outside the medical tent. She says, "There are people who are really, really bloody." McLean says, "they were pulling them into the medical tent."

The explosions took place about three hours after the winners crossed the finish line. The second one could be heard a few seconds after the first one.

A runner said, "There are a lot of people down."

Marathon workers were seen carrying one woman, who did not appear to be a runner, to the medical area as blood gushed from her leg.

More From K2 Radio