The man who tried to blow up a US airliner on a flight from Amsterdam had flown from Nigeria with a valid US visa, Dutch authorities said today. Security checks were carried out according to regulations before the Northwest Airlines plane took off for Detroit, a statement from the office of the Netherlands anti-terrorism coordinator said. But it could not rule out dangerous items being smuggled through that were difficult to detect with the usual technology. "Initial inquiries indicate that before the departure of the flight for the United States, Northwest Airlines communicated the list of passengers in line with standard procedures to the American authorities with their personal data, including those of the suspect." US authorities then gave clearance for the flight to depart, the NCTB said.<br/> A Nigerian who reportedly claimed to have links with Al-Qaeda tried to detonate an explosive device aboard the plane as it started its descent to Detroiton Saturday, before being overpowered by fellow passengers and crew. He was arrested after the Airbus A330 operated by Northwest Airlines landed.<br/>