One day after two bombs rocked the city of Boston, more details are surfacing about how the attacker may have carried out the terrifying acts.
Flowers sit outside the barricade surrounding a 12-block area near the Boston Marathon finish line. Onlookers have been taking photos of the scene of what one day ago was the site of a deadly terrorist attack.
The deadly attack wounded 170 people. many remain in critical condition, some suffering from traumatic amputations.
The feds are collecting bomb fragments, as well as cell phone videos and photos.
We are also learning more about the devices used in the blast, some of which is evident from the victims injuries.
"Probably this bomb had multiple metallic fragments in them and we removed pallets and nails," said a doctor at a Boston hospital.
It's believed someone placed duffle bags on the ground with pressure cookers inside filled with metal, nails, and ball bearings.
More than 24 hours later, no one is claiming responsibility, and the FBI is not confirming reports that agents are questioning a Saudi National injured in the blast. Police did searched his home in the suburb of revere.