Boston Marathon suspect could face death penalty

Boston's marathon bombing suspect Dzohkhar Tsarnaev was charged with an offence that could lead to the death penalty, if he is found guilty.

The charge - using a weapon of mass destruction - was put to the 19-year-old in his hospital bed, where he remains in a "serious condition."

A week on from the fatal explosions, a minute's silence was held across the United States in memory of those who died.

Washington Correspondent Robert Moore reports: