BOSTON (TheBlaze/AP) — An explosion at the finish line of the Boston Marathon Monday killed three people and injured dozens more. TheBlaze brought you intense live coverage of the aftermath. Considering all that has unfolded, here’s an an at-a-glance look at the facts in the case:

THE EXPLOSIONS

Two bombs exploded about 10 seconds and 100 yards apart at about 2:50 p.m. Monday in Boston’s Copley Square, near the finish line of the Boston Marathon. Three people were killed, including an 8-year-old boy named Martin Richard (TheBlaze has profiled Martin here), and more than 140 were injured. The explosions occurred four hours into the race and two hours after the winners had crossed the finish line, but thousands of runners were still on the course.

Heres Everything You Need to Know About the Boston Marathon Bombings

An injured woman is tended to at the finish line of the Boston Marathon, in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. Credit: AP

Yesterday, TheBlaze spoke with an eyewitness who explained what unfolded.

“I was probably 150 yards past the finish line,” Jerry McLaughlin, an Air Force and National Guard veteran, told TheBlaze. “You receive a blanket and food and proceed to pick up your baggage. Then we heard a boom, so we all turned around. Immediately there were tons of police officers there and they were pushing people to go down the street.”

THE INVESTIGATION

The FBI took charge of the investigation into the bombings, serving a warrant late Monday on an apartment in the suburban Boston town of Revere and appealing for any video, audio and still images taken by marathon spectators. No arrests had been made, and authorities weren’t commenting about suspects.

Heres Everything You Need to Know About the Boston Marathon Bombings

Bill Iffrig, 78, lies on the ground as police officers react to a second explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. Iffrig, of Lake Stevens, Wash., was running his third Boston Marathon and near the finish line when he was knocked down by one of two bomb blasts. Credit: AP

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PRESIDENTIAL RESPONSE

President Barack Obama vowed that those responsible will “feel the full weight of justice.” The president was careful not to use the words “terrorism” or “terrorist attack” in his remarks, but a White House official, speaking on condition of anonymity because the investigation was still unfolding, said the attack was being treated as an act of terrorism.

Appearing before reporters on Tuesday, Obama said the events in Boston were a “heinous cowardly act, and given what we now know about what took place, the FBI is investigating it as an act of terrorism. Any time bombs are used to attack innocent civilians it is” a terrorist act, he said. Still, he cautioned that it was not known who or what organizations might have carried it out. Read more about the press conference here.

Heres Everything You Need to Know About the Boston Marathon Bombings

People react as an explosion goes off near the finish line of the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions went off at the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. Credit: AP

SECURITY RESPONSE

The area around Copley Square remained closed Tuesday morning, as did exit ramps from major highways to the area. The Federal Aviation Administration barred low-flying aircraft within 3.5 miles of the site. Other cities also beefed up security in response to the bombing and the Secret Service expanded its security perimeter around the White House.

Heres Everything You Need to Know About the Boston Marathon Bombings

People react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. Credit: AP 

WHAT’S NEXT

The FBI, U.S. Attorney’s office and other law enforcement officials planned to brief the media at 9:30 a.m. Obama will be briefed Tuesday on the investigation and the ongoing response efforts from FBI Director Robert Mueller, homeland security assistant Lisa Monaco and other senior members of his team.

For TheBlaze’s complete coverage, including extensive videos and images of the events that unfolded, click here.

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