What was marathon bomb made of

People Making a Difference. Points of Progress. A Christian Science Perspective. Monitor Movie Guide. Monitor Daily. Photo Galleries. About Us. Get stories that empower and uplift daily. See our other FREE newsletters. By signing up, you agree to our Privacy Policy.

Select free newsletters: The Weekender. Today's Highlights. Christian Science Perspective. This image shows an unexploded metal bomb filled with explosive powder and lined with metal pellets that was entered as evidence in the trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev.

March 26, By Henry Gass Staff writer henrygass. You've read of free articles. Subscribe to continue. Mark Sappenfield. The second device was found four blocks from the site of the explosion and was removed safely. New York governor Andrew Cuomo said it appeared to be "similar in design" to the exploded device.

Both were different from a pipe bomb that detonated earlier on Saturday on the route of a charity race in New Jersey , Mr Cuomo added. That explosion caused no injuries. The unexploded second device was destroyed by police in a controlled explosion late on Sunday. A personal motivation? We do not know. We know it's a very serious incident. But we have a lot more work to do to be able to say what kind of motivation was behind this.

Mr Cuomo said: "Whoever placed these bombs - we will find them and they will be brought to justice. Some 1, extra security personnel are being deployed to New York's transport hubs, police said. The force of the blast blew out windows and could be heard several blocks away. Click to see Day 2 , Day 3 , Day 4 and Day 5. The young man studied the plastic milk cartons in the dairy aisle at the huge Whole Foods store in Cambridge, Massachusetts. It was p. Less than half hour earlier, twin bombs tore through the finish line of the Boston Marathon, creating a deadly scene of chaos and carnage.

But inside the store, all seemed normal. He finally grabbed one of the containers, walked over to the check-out counter and headed back to the parking lot. He needed the milk for his 2-year-old niece. His brother was there waiting in the car. But when the young man with the milk approached the car, he was waved off and told to go back into the store -- he bought the wrong kind.

The young man ran back inside, told the cashier he was going to exchange his carton of milk, and headed back out to the car. The two brothers pulled out of the parking lot and headed home, with the quart of milk and a dark, ugly secret that made them proud.

Tamerlan and Dzhokhar Tsarnaev were the two terrorists who had detonated a pair of bombs at the Boston Marathon, killing three and injuring more than others. They were about to become the most wanted men in the world -- hiding in plain sight, preparing for another attack. Thousands of federal agents and police across the U. Hundreds of videos and thousands of still pictures would be pored over, victims and witnesses interviewed, telephone records analyzed and more than a dozen possible suspects put under hour aerial and ground surveillance.

None of them would turn out to be the actual bombers. The Fourth of July had been the original target date.

But Tamerlan Tsarnaev , 26, and his younger brother Dzhokhar, 19, discovered it was much easier than they had first thought it would be to build the bombs, and in the last few days they had decided the marathon would be their target. Hundreds of thousands of people, many waving American flags and some wearing tri-cornered Minutemen hats, gathered all along the course. It was everything that the Tsarnaev brothers, sons of Muslim refugees from Kyrgyzstan, had come to hate about America.

The online videos they increasingly watched featured lectures about the Muslim children killed by U. He said residue from two bombs found near the finish line of the marathon on Boylston Street was consistent with fireworks, as was the evidence taken from Cambridge.

Agents at the bombing sites found large metal fragments with black residue that they scraped off to test, he said. Agents have testified they found nails, BBs, wire, a battery charger, a fuse and parts of pressure cookers at the apartment that they considered possible ingredients of a homemade bomb like those used at the marathon. Some of the evidence at the Cambridge apartment was vacuumed and bagged before being entered as evidence.

Earlier this week, the government presented receipts for a model truck, a remote control and items associated with radio control cars allegedly purchased by Tamerlan Tsarnaev.

There was fragmentation or shrapnel found at both bomb sites, Knapp testified. Knapp said a Christmas tree light bulb — like the ones found at the Tsarnaev family apartment — has enough power to set off a low explosive charge.