German police boarded a plane at Cologne airport and arrested two men suspected of terrorism on Friday just before the plane took off for Amsterdam.

A 23-year-old Somali man and a 24-year-old German man born in Somalia were arrested before the KLM flight left the airport, a spokeswoman for North Rhine-Westphalia state police said.

Police spokeswoman Katharina Breuer told the Associated Press that officers boarded the plane Friday morning and arrested the men without incident. She said authorities do not think the men planned to hijack the flight.

Germany's top-selling Bild newspaper, citing police sources, said the men had been under observation for months and a suicide note was found in their apartment saying that they wanted to die for the jihad, or holy war.

Breuer would not disclose how authorities knew the men would be on board.

Elfrieke van Galen, a KLM spokeswoman, said police boarded the Fokker 50 jet when it was at its "point of departure" and grabbed the two suspects. Van Galen said the 46 remaining passengers aboard KLM Flight 1804 were then forced to leave the plane.

"Then a 'baggage parade' took place to see if the two passengers who were taken by the police had bags with them," she said.

Van Galen said the plane took off after an hour delay and landed at Schipol airport in the Netherlands without further incident. A spokeswoman at the Cologne airport said other flights were not affected by the arrests.

The Dutch anti-terrorism chief warned earlier in September that the country remains one of the top targets for Islamic terrorist groups because of publicity surrounding a legislator's anti-Islam film.

Film makes Netherlands a 'target'

The national co-ordinator for combating terrorism said in a report that the film Fitna by legislator Geert Wilders has made the Netherlands a "preferred target" for Islamic groups.

Fitna set Koranic texts against a background of violent images, which the agency said "is considered a major insult and provocation" by terrorist groups.

The country's terrorist threat has been rated as "substantial" since the film's launch in March.

Frank Wallenta, a spokesman for federal prosecutors in Germany, said the arrests in Cologne were not related to an announcement Thursday that two men linked to terrorist suspects may be on their way back to Germany.

On Thursday, prosecutors announced that Eric Breininger, 21, and Houssain Al Malla, 23, could be headed to Germany after leaving a terrorist training camp in the border region between Afghanistan and Pakistan. The men are linked to a foiled plot to attack American targets in Germany in 2007.

Despite the warning and the incident in Cologne, Interior Ministry spokeswoman Daniela-Alexandra Pietsch said the threat level in Germany had not changed.

Germany is still in the "crosshairs of terrorism" but there are no indications of "concrete attack preparations," Pietsch said Friday.