About 24 hours before the arrest of Boston bombing suspect Dzhokhar Tsarnaev, a violent gun battle took place with police on the streets of Watertown, Boston - where the two brothers are said to have also tossed a pressure cooker bomb at authorities.
The Tsarnaev brothers used the same weapon during the marathon bombings.
Tonight in an OutFront Investigation, our David Mattingly learns just how easy it is to build and detonate one of these deadly weapons.
Two of the bombing suspects sisters live in New Jersey and are also being investigated by the FBI. Erin Burnett spent some time Monday with the mayor of West New York, who was with them on Friday in the moments after they learned their brother, Dzhokhar Tsarnaev, had been captured.
The mayor also told us, Tsarnaev's relatives are afraid to leave the house, and they have a police officer stationed outside the house out of concern for their safety.
The federal government file two charges against Boston marathon bombing suspect Dzhokhar Tsarnaev Monday, counts that could result in the death penalty if he's convicted.
The charges put an end to speculation that Tsarnaev would be tried as an enemy combatant. White House spokesman Jay Carney said that Tsarnaev is a naturalized U.S. citizen and cannot be tried by a military commission.
That decision intensified a debate over how to handle terrorism cases in this country. Today Senator Lindsey Graham (R-SC) urged the White House to reconsider.
"I am asking this administration to leave on the table the option that the evidence warrants to designate this individual as an enemy combatant. " Graham added, "The ability to have access to this suspect without a lawyer present to gather intelligence about a future attack is absolutely essential to our national security. "
Democratic Congressman Adam Schiff - a member of the House Intelligence committee is OutFront.