Carrie Johnson

Federal sources say ballistics evidence ties a man arrested at Arlington National Cemetery last week to a series of mysterious shootings in the Washington, D.C., area.

Yonathan Melaku, 22, a member of the U.S. Marine Corps Reserves, has been in custody since police found him wandering last week after the cemetery had closed. He was carrying a backpack he said was full of explosives. The FBI later determined the material in the backpack was inert.

Jim Risen, a reporter for The New York Times, will ask a court Tuesday to throw out a Justice Department subpoena. Risen says he doesn't want to testify against a CIA agent accused of leaking classified information.

Risen has a history of digging for government secrets and finding pay dirt. He helped expose the government's warrantless wiretapping program. And he ventured into the shadows again to write a history of the CIA during President George W. Bush's years.

The case of two Iraqi refugees captured in Kentucky after an FBI sting operation is reigniting the political debate over where to bring terrorists to justice.

Sen. Mitch McConnell of Kentucky says the men pose a danger to the people in his state and he wants them sent to Guantanamo Bay, the U.S. detention facility in Cuba. But, Justice Department leaders say the real danger is fear-mongering by politicians.

Three agents from the Bureau of Alcohol Tobacco and Firearms marched to Congress on Wednesday to blow the whistle on a risky operation targeting gun traffickers.

They told the House Government Reform Committee that more than 1,000 guns tied to the ATF's investigation of drug cartels are still missing somewhere in the U.S. and Mexico. Lawmakers want to know who approved the operation in the first place.

The House Homeland Security Committee will hold a hearing Wednesday that looks at terrorist recruitment inside the walls of American jails and prisons. The last time New York Congressman Peter King (R) examined radicalization among Muslims, he generated a huge backlash from religious and civil rights groups.

But people who study prisons said the number of criminals who turn to extremism behind bars is small but worrisome. And they all point to the same case to open the conversation.