Japan tsunami: Silence to mark one year anniversary

Japan is marking the first anniversary of the devastating earthquake and tsunami which struck the north-eastern coast, killing thousands.

Warning sirens sounded at the precise time the quake struck, preceding a minute of silence that was observed around the country.

The magnitude 9.0 quake, the most powerful since records began, also triggered a serious nuclear accident at the Fukushima Daiichi nuclear plant.

Andy Moore reports.