Fears about the possible spread of radiation has caused unease in Tokyo, Japan's capital and a usually bustling metrolpolis.

Several companies are evacuating staff, and many citizens are leaving the city, despite assurances from the government that they are safe.

Those who choose to remain in Tokyo are stocking up on supplies including canned goods, batteries, bottled water, face masks and petrol.

Al Jazeera's Andrew Thomas reports from Tokyo.