Terrorists with Western links a growing threat

authorities filed treason charges against him in 2006 and have offered a $1 million reward for information leading to his arrest or conviction. Despite rumors he had been killed or captured, Gadahn appeared in a video last September marking the 11th anniversary of the Sept. 11 attacks.

GLASGOW AIRPORT ATTACK

On June 30, 2007, a jeep loaded with propane canisters slammed into the terminal of the Glasgow International Airport in Scotland, setting the building on fire. Five bystanders were injured. Both occupants of the vehicle were arrested. Police identified them as Bilal Abdulla, a British-born, Muslim doctor of Iraqi descent and Kafeel Ahmed, the driver. Anti-terrorism officials said Abdulla became radicalized due to the Iraq war. Ahmed, an Indian engineering student, died of his burns. Abdulla was convicted of conspiracy to commit murder and was sentenced to 32 years in prison.

AHMAD OMAR SAEED SHEIKH

Following his education in Britain, the British-born Sheikh traveled to South Asia, where he joined Islamic militant groups. He was sent to prison for kidnapping Western tourists in India in 1994, but was released to Pakistan five years later in an exchange of prisoners following the hijacking of an Indian airliner to Afghanistan. In 2002 he was convicted of kidnapping and murder in the death of Wall Street Journal reporter Daniel Pearl and sentenced to death. His appeal is still pending in a Pakistani court.