The operator of Japan's crippled nuclear power plant says it has detected what is believed to be the highest level of radiation found in the air at the Fukushima Daiichi plant so far.
Radiation of up to 4-thousand millisieverts per hour was detected in the building housing the No. 1 reactor at the plant.
The radiation is so high now that any worker exposed to it would absorb the maximum permissible dose of 250 millisieverts in only about four minutes.
TEPCO said there is no plan to place workers in that area of the plant and it will carefully monitor any developments
Meanwhile, Japan's NHK reported on Sunday that trace amounts of plutonium were detected in soil samples some 1.7 kilometers away from the Fukushima nuclear facility.
This is the first time plutonium has been found outside the power plant.