National Security

Dzhokhar Tsarnaev, who was charged today in his hospital room, is eligible for the death penalty.

U.S.-Russian relations are strained, but in the aftermath of the Boston marathon bombings, the two governments are trying to communicate to help the investigation. NPR's Michele Kelemen talks with Weekend Edition Saturday host Scott Simon about the state of their complicated relationship.

FBI and SWAT teams are trying to locate a suspect in Monday's bombing at the Boston Marathon. The other suspect, his brother, was killed earlier in a shootout with police. Dr. David Schoenfeld of Beth Israel Hospital talks about Thursday night's police action in Watertown.

The scene in suburban Boston early Friday was chaotic. Steve Inskeep and David Greene talk with NPR's Jeff Brady and WBUR reporter Fred Bever for the latest on the Boston Marathon bombings investigation.

For the latest on the Boston Marathon Bombing case, David Greene and Steve Inskeep talk to Fred Bever of member station WBUR and Chechen expert Thomas de Waal of the Carnegie Endowment for International peace

David Greene and Steve Inskeep talk to David Boeri of member station WBUR, NPR's Dina Temple-Raston and Zolan Young, an intern at The Boston Globe, about the suspects in the Boston Marathon bombing.

Many areas in Boston are on lock down as authorities continue the hunt for one of two Russian-born brothers of Chechen background. For details, David Greene talks to Jeff Brady.

Explosions at the Boston Marathon, potentially ricin-laced letters intercepted en route to the White House and Sen. Roger Wicker, and an explosion at a fertilizer plant in Texas have each prompted investigations. In each case, authorities sift through evidence to construct a timeline of events.

Marathons are among the most open sporting events. Crowds can press right up against the route as runners wind there way through city streets. But two explosions at the Boston Marathon have raised questions about whether that openness can last.

The Special Agent in Charge of the FBI Boston office Rick DesLauriers hopes someone, somewhere heard something that will point to a suspect in the Boston Marathon attack. Three people were killed Monday in the attack.

The bombings at the Boston Marathon have lead to heightened security across the world. Organizers of the London Marathon contacted local police to discuss increased security measures. Officials in California monitored its emergency system after the blast.

Less than 24 hours after two explosions rocked the finish line at the Boston Marathon and there are still more questions than answers about what happened. Three people were killed and more than 170 were injured. The FBI is investigating the event as an act of terrorism.