As the nuclear disaster continues in Japan, more tea leaves have been found with extremely high levels of cesium.

The Japanese health ministry says radioactive cesium has been detected in harvested tea leaves in Chiba and Saitama prefectures, near Tokyo  (about 297km or 185 miles from the Fukushima Daiichi nuclear plant).

One type of tea from Chiba Prefecture contained 2,720 becquerels of radioactive cesium per kilogram, more than 5 times the safety limit.

1,530 becquerels per kilogram was detected in three kinds of tea leaves from Saitama Prefecture.

The local governments will try to trace which tea farms the contaminated leaves came from.