This timeline of events will be updated as the story progresses. All information has been obtained by the Associated Press, all time is Eastern Standard Time.
10:52 p.m. The injury toll is now more than 140 with 17 in critical condition.
8:54 p.m. Boston police: At least 3 people killed in marathon bombing.
6:37 p.m. British police are reviewing security plans for Sunday’s London Marathon, the next major international marathon, because of the bombs that killed two people at the race in Boston. But there is no known specific or credible threat against the hugely popular British race at the moment, a security official said Monday.
6:25 p.m. The AP now reports more than 80 injuries in Boston this afternoon.
6:16 p.m. The AP reports that the head of an extremist Jordanian Muslim Salafi group says he is “happy to see the horror in America” after the explosions in Boston.
“American blood isn’t more precious than Muslim blood,” said Mohammad al-Chalabi, who was convicted in an al-Qaida-linked plot to attack U.S. and other Western diplomatic missions in Jordan in 2003.
A Mideast counterterrorism official based in Jordan said the blasts “carry the hallmark of an organized terrorist group, like al-Qaida.” He did not give actual evidence.
Both officials insisted on anonymity.
6:11 p.m. The AP reports more than 70 injuries now from the explosions at the Boston Marathon.
6:10 p.m. “We don’t yet have all the answers,” Obama said.
He said he has notified the appropriate constituencies in Washington.
“We still do not know who did this and why,” Obama said. “But make no mistake, we will get to the bottom of this.”
6:10 p.m. President Obama is currently speaking on the explosions in Boston.
6:01 p.m. The Boston police commissioner says no suspect is in custody for the marathon explosions.
6 p.m. According to the AP, officials say the Kentucky Derby events will go on as planned despite the bombings at the Boston Marathon.
5:45 p.m. The AP reports that President Barack Obama will speak from the White House this evening on the events in Boston.
5:43 p.m. EST, 4:43 p.m. CST According to bostonmarathon.org, Sara Stoffel from Murray, Ky., was in the Boston Marathon today. Her finish time was at 1:58 p.m. and several reports by family members and friends indicates she is safe and at a nearby hotel.
5:31 p.m. The AP reports more than 50 people have been injured in the two explosions near the finish line.
5:26 p.m. The Secret Service says it has expanded its security perimeter at the White House following the events at the Boston Marathon.
Spokesman Ed Donovan said it is not unusual to expand or contract the security perimeters. Shortly after the explosions, Secret Service shut down Pennsylvania Avenue outside the White House.
5:21 p.m. Attorney General Eric Holder has directed full resources of the Justice Department be deployed to investigate the bombs that exploded at the marathon.
5:12 p.m. There has been no immediate word on the motive or person responsible for the attacks. According to local hospitals, at least eight of the wounded are in critical condition.
5:06 p.m. The AP reports the total numbers of casualties from the first two blasts is not known.
4:59 p.m. Boston police say there has been a third explosion in the city. Police Commissioner Edward Davis says authorities are not certain that the explosion at the JFK Library was related to the other blasts, but they are treating them as if they are.
There are no injuries stemming from the third explosion.
4:55 p.m. A law enforcement official told the AP cellphone service has been shut down in the Boston area to prevent any potential remote detonations of explosives. The AP still reports two dead and 23 injured.
4:41 p.m. One runner, a Rhode Island state trooper, said the blasts tore limbs off dozens of people.
4:34 p.m. British police are reviewing security plans for Sunday’s London Marathon.
4.31 p.m. President Barack Obama called Boston’s mayor and the Massachusetts governor to express his concern and condolences for those injured in the incident.
4:29 p.m. The Federal Aviation Administration is warning pilots of a no-fly zone over the site of the explosions.
4:24 Two more explosives were found in the area near the Boston Marathon, officers worked on dismantling them.
4:08 p.m. Boston Police Department reported there were two dead and 22 injured in the two explosions near the finish line.
4:04 p.m. Boston Marathon organizers stated the explosions were caused by bombs.
3:04 p.m. Two explosions at the finish line of the Boston Marathon resulted in injuries.
Timeline compiled by Lexy Gross, Editor-in-Chief.