Tokyo Electric Power Company (TEPCO), the operator of the crisis hit Fukushima No. 1 nuclear power plant, officially announced some radioactive water leaking from broken pipes was found inside the reactor building.

The leaking point was found on the first floor in the No. 4 reactor building by the staff Tuesday night. About 10 minutes later the leak was stopped by closing a valve. TEPCO determined the water was from the reactor by measuring the radioactive level.

TEPCO is trying to find out the reason of the water pipes damage which may relate with the frigid temperatures below minus 8 degrees Celsius in recent days or the explorations after the tsunami on March 11.

TEPCO had admitted on Monday that there are 14 leaking points at the stricken Fukushima No. 1 nuclear power plant's facilities, leading the operator to suspend the cooling of the spent fuel pool at its No. 4 reactor for two hours. But TEPCO said it is believed that the radioactive water did not flow into the ocean.

Over 26 water pipe leak accidents have happened in Fukushima No. 1 nuclear power plant due to low temperatures.