A 25-year-old man was arrested after allegedly crashing a truck through the gate of a nuclear power station near Japan's stricken reactors, news reports said Friday.
Hikaru Watanabe, a Tokyo resident, allegedly forced his truck, equipped with loudspeakers, through the western gate of the Fukushima Daini Nuclear Power Station, the Kyodo News Agency said, dpa reported.
The plant is 12 kilometres south of the Fukushima Daiichi plant in north-eastern Japan, which is struggling with overheating reactors and radiation leaks after it was damaged in the March 11 earthquake and tsunami.
Watanabe had tried about 50 minutes earlier to gain access to the Fukushima Daiichi plant but had been turned away by security personnel, the report said.
After entering Fukushima Daini, he drove around the plant's grounds for about 10 minutes, Kyodo reported, citing the two plants' operator, the Tokyo Electric Power Co.
No one was injured in the incident.
Watanabe was arrested on charges of unlawful entry and damage to property, Kyodo reported, citing local police. He has confessed to the charges, but the objective of his intrusion remained unknown, Kyodo said.
The truck and its driver underwent radiation decontamination before being taken to police, Kyodo said.
Unlike the neighbouring plant, the four reactors at Fukushima Daini were "basically in a stable situation" because the quake forced them to carry out a "cold shutdown," where the fuel rods are stored in a way which prevents them from overheating.
The government has ordered the operator to reinforce all measures to ensure security at the nuclear power plants.