The Nigerian man accused of trying to blow up a flight from Amsterdam to Detroit on December 25 probably brought the explosives with him from Nigeria and did not appear to have had an accomplice at Schiphol airport, the public prosecution department said on Tuesday.

An initial police investigation shows Umar Farouk Abdulmutallab probably acted alone. Some other passengers on the flight say they saw him together with a smartly dressed ‘Indian’ man who told airport officials Abdulmutallab was from Sudan and did not have a passport.
But a study of 200 hours of security camera footage from the transfer and shopping area has not found any back-up evidence, the department said.
‘The investigation so far has uncovered no evidence that the suspect had contact with possible accomplices at Schiphol, left the transfer area or showed suspicious behaviour,’ the statement said.
Underwear
Abdulmutallab is charged with trying to blow up Northwest Flight 253 with a highly explosive substance hidden in his underwear. He was overpowered by passengers who saw smoke as he attempted to set off his bomb.
Abdulmutallab flew from Lagos to Amsterdam on a KLM flight. The seats from that plane are still being examined for traces of explosives. Detectives have also interviewed dozens of witnesses, including security and airline officials from that flight, the department said.
The statement said Abdulmutallab, 23, spent around one hour in the transfer area before registering for his flight to Detroit at 7am. There he was asked about the purpose of his visit to the US and underwent a security check. That check did not find the explosives which were hidden in his underpants.
The public prosecutor could not say when the investigation, which involves intense contact with the US authorities, would be completed.