BOSTON (AP) - Authorities investigating the deadly bombings at the Boston Marathon have recovered a piece of circuit board that they believe was part of one of the explosive devices, and also found the lid of a pressure cooker that apparently was catapulted onto the roof of a nearby building, an official said Wednesday.
A law enforcement official briefed on the investigation confirmed to The Associated Press that authorities have recovered what they believe are some of the pieces of the explosive devices. The official spoke on condition of anonymity because this person was not authorized to publicly discuss evidence in the ongoing investigation.
A person close to the investigation previously told AP the bombs consisted of explosives put in 1.6-gallon pressure cookers, one with shards of metal and ball bearings, the other with nails.
Also Wednesday, a doctor at Boston Medical Center said two patients, including a 5-year-old child, remain in critical condition there. Dozens of others have been released from hospitals around Boston.
Law enforcement agencies pleaded Tuesday for the public to come forward with photos, videos or any information that might help them solve the twin bombings that killed three people and wounded more than 170 a day earlier. Investigators circulated information about the bombs, which involved kitchen pressure cookers packed with explosives, nails and other lethal shrapnel - but the FBI said nobody had claimed responsibility.
"Someone knows who did this," Richard DesLauriers, FBI agent in charge in Boston, said at a news conference where he detailed the type of clues a bomber might have left. "Importantly, the person who did this is someone's friend, neighbor, co-worker or relative."
President Barack Obama plans to attend an interfaith service Thursday in the victims' honor in Boston.
Scores of victims of the Boston bombing remained in hospitals, many with grievous injuries. Doctors who treated the wounded corroborated reports that the bombs were packed with shrapnel intended to cause mayhem. In addition to the 5-year-old child, a 9-year-old girl and 10-year-old boy were among 17 victims listed in critical condition.
The trauma surgery chief at Boston Medical Center says most of the injuries his hospital treated after the marathon bombings were to the legs.
"We have a lot of lower extremity injuries, so I think the damage was low to the ground and wasn't up," Dr. Peter Burke said. "The patients who do have head injuries were blown into things or were hit by fragments that went up."
Dozens of patients have been released from hospitals around the Boston area.
At Massachusetts General Hospital, all four amputations performed there were above the knee, with no hope of saving more of the legs, said Dr. George Velmahos, chief of trauma surgery.
"It wasn't a hard decision to make," he said Tuesday. "We just completed the ugly job that the bomb did."
An intelligence bulletin issued to law enforcement includes a picture of a mangled pressure cooker and a torn black bag that the FBI said were part of a bomb that exploded during the marathon.
DesLauriers said cooperation from the community will play a key role in the investigation. He said the range of suspects remained wide open, but by midday Tuesday more than 2,000 tips had been received.
The bombs exploded 10 or more seconds apart, tearing off victims' limbs and spattering streets with blood. The blasts near the finish line instantly turned the festive race into a hellish scene of confusion, horror and heroics.
The blasts killed 8-year-old Martin Richard, of Boston, and 29-year-old Krystle Campbell, of Medford. The Shenyang Evening News, a state-run Chinese newspaper, identified the third victim as Lu Lingzi. She was a graduate student at Boston University.
Officials found that the bombs in Boston consisted of explosives put in ordinary, 1.6-gallon pressure cookers, one with shards of metal and ball bearings, the other with nails, according to a person close to the investigation who spoke on condition of anonymity because the probe was still going on.
Both bombs were stuffed into black bags and left on the ground, the person said.
DesLauriers confirmed that investigators had found pieces of black nylon from a bag or backpack and fragments of BBs and nails, possibly contained in a pressure cooker. He said the items were sent to the FBI laboratory at Quantico, Va., for analysis.
Pressure-cooker explosives have been used in international terrorism, and have been recommended for lone-wolf operatives by al-Qaida's branch in Yemen.
But information on how to make the bombs is readily found online, and U.S. officials said Americans should not rush to judgment in linking the attack to overseas terrorists.
Pressure-cooker explosives have been used in Afghanistan, India, Nepal and Pakistan, according to a July 2010 intelligence report by the FBI and the Homeland Security Department. One of the three devices used in the May 2010 Times Square attempted bombing was a pressure cooker, the report said.
"Placed carefully, such devices provide little or no indication of an impending attack," the report said.
Investigators in the Boston bombing were combing surveillance tapes from businesses around the finish line and asking travelers at Logan Airport to share any photos or video that might help.
(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)
Tuesday, December 10 2013 9:31 AM EST2013-12-10 14:31:13 GMT
Westbound lanes of the turnpike are restricted early Tuesday morning due to a crash involving two semi trucks and a tow truck. Dispatchers with the turnpike say the crash happened sometime after 2 a.m. AccordingMore >>
Westbound lanes of the turnpike are restricted early Tuesday morning due to a crash involving two semi trucks and a tow truck.More >>
Tuesday, December 10 2013 9:05 AM EST2013-12-10 14:05:22 GMT
JOHANNESBURG (AP) - U.S. President Barack Obama implored thousands gathered in a cold, rainy stadium and millions watching around the world on Tuesday to carry forward Nelson Mandela's mission of erasingMore >>
U.S. President Barack Obama implored thousands gathered in a cold, rainy stadium and millions watching around the world on Tuesday to carry forward Nelson Mandela's mission of erasing injustice and inequality.More >>
Tuesday, December 10 2013 5:53 AM EST2013-12-10 10:53:29 GMT
Toledo Police are responding to reports of two people shot.It happened just before 8:30 p.m. on Pearl Street. That's near Manhattan and Lagrange.At this time, there is no word on the extent of the injuries.13abcMore >>
Toledo Police confirm two people were killed in a shooting in North Toledo.More >>
Tuesday, December 10 2013 5:11 AM EST2013-12-10 10:11:36 GMT
Two tractor trailers collided on the Ohio Turnpike in Lake Township early Tuesday morning. It happened around 2 AM in the westbound lanes near the I-280 interchange. Ohio State Highway Patrol dispatchersMore >>
Two tractor trailers collided on the Ohio Turnpike in Lake Township early Tuesday morning.
It happened around 2 AM in the westbound lanes near the I-280 interchange. Ohio State Highway Patrol dispatchers say one semi was pulled over getting assistance from a tow truck when it was clipped by another semi.
Only minor injuries were reported in the crash.More >>
Monday, December 9 2013 5:26 PM EST2013-12-09 22:26:32 GMT
A fire destroyed the home of a mother and her four sons just weeks before Christmas.It happened Saturday evening in the 2000 block of County road 32 in Helena Ohio. 13abc's Alexis Means explains how theMore >>
The community reaches out to help a mother and her four sons after their house was destroyed by fire on Saturday.More >>
Tuesday, December 10 2013 10:02 AM EST2013-12-10 15:02:35 GMT
(12/09/13) - They represent manufacturing, retail, and infrastructure -- and they're all from Northwest Ohio. Scott Buehrer, Roger Shope, and Kelly Wicks, participated in a forum with 50 other businessMore >>
They represent manufacturing, retail, and infrastructure -- and they're all from Northwest Ohio.More >>
Tuesday, December 10 2013 8:34 AM EST2013-12-10 13:34:28 GMT
Some of the workers left jobless by the sudden shutdown of MedCorp say they plan to file a lawsuit against the company for failing to give them notice. The workers were left Friday night without 60 dayMore >>
Some of the workers left jobless by the sudden shutdown of MedCorp say they plan to file a lawsuit against the company for failing to give them notice.More >>
Tuesday, December 10 2013 6:05 AM EST2013-12-10 11:05:11 GMT
DETROIT (AP) - Former Detroit Mayor Kwame Kilpatrick is relying on others to tell him how much he owes the city. Kilpatrick has waived his attendance at a court hearing Tuesday that will determine hisMore >>
DETROIT (AP) - Former Detroit Mayor Kwame Kilpatrick is relying on others to tell him how much he owes the city.
Kilpatrick has waived his attendance at a court hearing Tuesday.
Monday, December 9 2013 10:42 PM EST2013-12-10 03:42:00 GMT
It's been almost a year to the day, that Julia Niswender, 23, was found dead in her apartment.Monday night, her family and closest friends held a candle light vigil to remember her and keep her story inMore >>
Family and friends remember Julia Niswender, 23, Monday night. The Eastern Michigan student was found dead in her apartment in December 2012. Police have not made any arrests in the case.More >>