Japan quake: Radiation testing begins amid mass evacuations

Concerns are being raised over three separate nuclear reactors at Fukushima following an explosion at one on Saturday, with some fearing the reactors could overheat leading to a meltdown.

Officials are reassuring the public there is no immediate danger but an exclusion zone around the facility has been extended and the evacuation of people from the area now runs into the hundred of thousands.

Chris Hogg reports.