The biggest question in Boston remains: Who did it?

Runner John Ounao crying when he finds friends after several explosions rocked the finish of the Boston Marathon in Boston, Massachusetts, on April 15, 2013. Credit: Getty Images
Runner John Ounao crying when he finds friends after several explosions rocked the finish of the Boston Marathon in Boston, Massachusetts, on April 15, 2013. Credit: Getty Images

Investigators said that two bombs that tore through the crowd at the Boston Marathon finish line Monday may have been fashioned out of shrapnel-filled pressure cookers that were transported in black nylon backpacks.

Boston doctors treating the wounded told reporters today that several of the victims were maimed by what appeared to be pieces of plastic and metal. The fragments were removed during surgery, and turned over to authorities.

Federal Bureau of Investigation Special Agent Richard DesLauriers, who is heading up the investigation, said the pressure cooker bombs may have also contained ball bearings and nails.

As of this evening, no one had taken responsibility for the bombings, and investigators had made no arrests in connection with the attack, which killed three people and injured more than 170. The explosions happened around 2:50 p.m. Monday near the finish line of the Boston Marathon, on Boylston Street.

Authorities said they had received more than 2,000 tips as of noon, many of which were reviewed by 5 p.m.

“The investigation in its infancy. We will thoroughly review each and every piece of evidence,” DesLaurier said, also pleading with the public to provide more information.

The FBI is looking for people who might have seen or heard suspicious activity, including someone carrying a dark, heavy bag near the site of the blasts before the explosions. DesLaurier asked people to inform investigators if they heard any noises similar to an explosion in the days before the attack, as they may indicate a practice blast, and also if anyone overheard discussions a possible attack on the Boston Marathon.

“The range of suspects and motives remains wide open. We’re asking for tips from anyone who may target the event,” he said.

Forensic experts are reconstructing the suspected explosive devices at an FBI lab in Virginia to determine its components. More information is expected during a media briefing this afternoon, but in the meantime DesLaurier asked the public to “remain alert.”

Boston Mayor Thomas M. Menino joined officials at the briefing this evening, commending civilians and emergency respondents for their assistance.

“We are Boston. We are one community and we will not let terror take us over,” he said.

Follow Morgan Rousseau on Twitter: @MetroMorgan
Follow Metro Boston on Twitter: @MetroBOS


News
Entertainment
Sports
Lifestyle
International

South Korea ferry disaster: captain's actions 'tantamount to…

The captain and some crew members of the sunken South Korean passenger ferry Sewol have been accused of 'murderous acts' by their own president, after…

News

Easter Egg hunt horror as skydiver plummets to…

A FAMILY Easter egg hunt ended in horror when a skydiver plummeted to his death in a New York garden after his parachute failed to…

News

Boston Marathon 2014 on high alert, Red Sox…

One year on from the horrific Boston Marathon bombings a ring of steel has been thrown around today's race, and a city stands defiant against…

News

Boston Strong: One year on from Boston Marathon…

  For more than a century the Boston Marathon has been an even centred around sportsmanship, endurance and athleticism, but there's no denying the face…

Television

‘Mad Men’ recap: Season 7, Episode 2, ‘A…

Peggy and Lou are horrible, Bert's racist, Don is honest(ish) and Roger and Pete are frustrated. "A Day's Work" not quite worthy of "This Will Be Our Year."

Television

'Game of Thrones' recap: Season 4, Episode 3,…

The problem with the devil you know is that ignoring them doesn’t mean they simply lie in wait. It allows them time to do things…

Television

Discovery cancels 'Everest Jump Live' special in wake…

The Discovery Channel has indicated it will not be moving forward with "Everest Jump Live," a planned special about mountain climber Joby Ogwyn's effort to…

The Word

'X-Men' director Bryan Singer drama continues

  News broke late last week that "X-Men" and "The Usual Suspects" director Bryan Singer is being sued by a man who said Singer molested…

NHL

Ray Emery steps up in Flyers’ Game 2…

Sure, he allowed two goals in the Rangers’ first four shots Sunday afternoon, but it’s about how you start, not how you finish.

NHL

Flyers come from behind, even series with Rangers

The Flyers overcame a two-goal deficit to get a much-needed win at Madison Square Garden Sunday.

MLB

Phillies get set for four against the Dodgers

The Phillies will face tough starting pitching out west against the Dodgers this week.

MLB

Phillies notebook: Cole Hamels returns this week

The Phillies should receive a big boost when Cole Hamels returns during the Dodgers series.

Travel

Packing: The one thing you need in your…

A new survey that looks at the travel habits of 50,000 people around the world has revealed that Western and Asian globetrotters have different priorities…

Home

Is your chair making it hard to talk?

Ever wished there was an office chair that could make impromptu meetings and discussions more private? The Cristiana Wing Chair is an asymmetrical armchair which…

Travel

Live large at these luxury hotels

From Thai boxing lessons and macabre Dracula tours to the Australian Outback, the Four Seasons hotel chain launched a series of new travel packages this…

Parenting

4 things that every summer camp should have

Alan Saltz, director of the 92nd street Y program lists things that every summer camp should have.