A Swedish contractor was arrested on Wednesday when traces of highly explosive material were found on him as he was about to enter a nuclear power plant in southern Sweden, police and the plant said."At 8:00 a.m. (0600 GMT) we received a call from the nuclear plant at Oskarshamn. They told us one worker was stopped in the control. He had explosive material in his bags," Sven-Erik Karlsson of the Kalmar county police said.The company that operates the Oskarshamn plant, OKG, meanwhile said the man's bags contained "no visible illegal substances" but routine tests at the entrance to the plant "detected traces of explosives.""We can see that our security routines functioned properly," the managing director of OKG, Lars Thuring, said in a statement, adding that the plant was collaborating with police.Karlsson said the man, who was being interrogated by police, was a welder hired for temporary purposes, but could provide no further details on his age nor his background."The explosive material has been taken care of by . police and apparently it is highly explosive, probably TATP," Karlsson said.TATP is relatively easy to make and has surfaced in a number of recent terrorism investigations, including bombings in the Middle East and the London bombings in July 2005.It was the same type of explosive that Al-Qaeda "shoe bomber" Richard Reid tried to detonate on a Miami-bound flight in December 2001, three months after the September 11 attacks in New York and Washington that killed some 3,000.
