“A law enforcement source told CBS News senior investigative producer Pat Milton that one of the explosive devices appears to have been placed in a metal pressure cooker (a metal kitchen pot with a locked-down top) which had been placed in a black nylon bag or backpack. Investigators also found pieces of an electronic circuit board possibly indicating a timer was used in the detonation of the bomb.
A law enforcement official told CBS News that the two bombs that exploded were made to look like discarded property. It is still unknown if one or both bombs were in garbage cans. One may have been on the sidewalk.
The bombs were described as “low explosive,” but with “anti-personnel” packing. The official said there were apparently things like BB’s, ball bearings and nails in the bombs.
Law enforcement sources told CBS News’ Milton that a Saudi Arabian man who was being questioned by investigators is not being considered a suspect at this time, and it appears that he was a spectator who was injured in the attack.
“Two powerful bombs exploded near the finish line of the Boston Marathon on Monday afternoon, killing three people, including an 8-year-old child, and injuring more than 100. …
Almost three-quarters of the 23,000 runners who participated in the race had already crossed the finish line when a bomb that had apparently been placed in a garbage can exploded around 2:50 p.m. in a haze of smoke amid a crowd of spectators on Boylston Street, just off Copley Square in the heart of the city. Thirteen seconds later, another bomb exploded several hundred feet away.
The F.B.I. took the lead role in the investigation on Monday night.
There were conflicting reports about how many devices there were. One law enforcement official said there had been four: the two that exploded at the marathon and two others that were disabled by the police. The official said that the devices appeared to have been made with black powder and ball bearings, but that investigators were unsure how the two that exploded had been set off.
It was unclear Monday evening who might be responsible for the blast. Although investigators said that they were speaking to a Saudi citizen who was injured in the blast, several law enforcement officials took pains to note that no one was in custody.
“The Following Information is Preliminary:
• At about 2:50pm, on Monday, April 15, 2013, Boston Police responded to two large explosions along the Boston Marathon route in the area of 673 Boylston Street.
• The Boston Police Department is confirming two fatalities and over twenty injuries.
• At about 4:12pm, the Boston Police Department responded to a 3nd explosion or fire in the area of the JFK Library in Dorchester. Officials are working to determine the nature of the incident. There are no injuries to report in connection to that incident.
• At present, a multi-agency response including state and federal law enforcement agencies has been activated and is investigating the cause of the explosions. At this point, it is uncertain if the explosions are connected.
What Community Members Should Do:
• Residents and visitors to the city are encouraged to stay calm.
• Residents and visitors are asked to avoid the Copley Square area so as to allow law enforcement agencies to continue their investigation.
• Family members looking for information relative to individuals possibly injured during the incident are encouraged to call (617) 635-4500.
• Community members wanting to assist this investigation anonymously are encouraged to call the Boston Police Department’s Crime Stoppers Tip Line at 1 (800) 494-TIPS (8477) or text the word TIP to CRIME (27463). Individuals who may have been taking pictures or video are asked to share that information.
• Continue to monitor BPDNews.com or @boston_police on Twitter for ongoing public safety updates.
“Eyewitnesses at the scene said there were two loud explosions about five seconds apart, and emergency vehicles crowded the scene. …
Witness Dave Weigel said via Twitter minutes after the explosion: ‘I saw people’s legs blown off. Horrific. Two explosions. Runners were coming in and saw unspeakable horror.’
A source told MailOnline that there were shotgun shells in the two bombs, which sprayed onlookers and runners with massive amounts of shrapnel.
“Multiple casualties are reported after at least two explosions were heard near the finish line of the Boston Marathon, according to the Boston Herald.
Witnesses reportedly heard booms that sounded like two claps of thunder near the finish line inside the Fairmount Copley Plaza Hotel.
The explosions occurred just before 3 p.m. Video of the scene showed a number of emergency crews in the area tending to victims and blood on the ground near the finish line.
A photographer with Fox affiliate WFXT reported seeing a number of victims with lost limbs.
Competitors and race organizers were crying as they fled the chaos. Bloody spectators were being carried to the medical tent that had been set up to care for fatigued runners.
“Bloody spectators were being carried 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. 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.
“An explosion has occurred at the Boston Marathon finish line. CBS reports at least 12 have been injured.
Some of the injured are being treated at the scene.
Authorities are investigating reports of two explosions at the finish line.
There were two booms heard from near the finish line inside the Fairmount Copley Plaza Hotel.
“At least one explosion struck near the finish line of the Boston Marathon on Monday, police and witnesses said.
The explosion occurred as thousands of runners finished the 117th running of the Boston Marathon, with crowds watching and cheering at the finish.
“There was an explosion, police, fire and EMS are on the scene. We have no indication of how many people are injured,” a spokeswoman for the Boston Police Department said.
Mike Mitchell of Vancouver, Canada, a runner who had finished the race said he was looking back at the finish line and saw a “massive explosion.”
” — Copyright 2013 Thomson Reuters