Second Boston bomber suspect Dzhokhar Tsarnaev arrested

The teenage suspect in the Boston Marathon bombings is in custody after being found hiding in a boat in a suburban homeowner's backyard.

Police said they exchanged gunfire with Dzhokhar Tsarnaev, 19, after cornering him in Watertown, near Boston. He had evaded police for four days after Monday's attacks, which left three people dead and more than 170 injured.

Jubilant crowds cheered police when the news was announced.

Ian Pannell reports.