Japan earthquake: Radiation checks amid plant problems

Radiation from Japan's Fukushima Daiichi nuclear plant has reached harmful levels, the government says.

The warning comes after the plant was rocked by a third blast which appears to have damaged one of the reactors' containment systems for the first time.

Officials have extended the danger zone, warning residents within 30km (18 miles) to evacuate or stay indoors.

Pictures show residents being checked for radiation exposure at a nuclear testing station in Koriyama.