LONDON (AP) — British police say a former Guantanamo Bay detainee is one of four people arrested on suspicion of Syria-related terrorism offenses.

West Midlands Police said Tuesday that Moazzam Begg was arrested in the Birmingham area of central England.

Police say 45-year-old Begg is suspected of attending a terrorist training camp and facilitating terrorism overseas.

He was arrested along with a 44-year-old woman, her 20-year-old son, and a 36-year-old man. Their names were not released.

There has been an increase in recent months in the number of Britons traveling to Syria to join the battle against the forces of President Bashar Assad.

Begg was arrested in Pakistan in 2002 and sent to the U.S. prison camp in Cuba.

After his release in 2005 he became director of the detainee advocacy group Cage.

Copyright 2014 The Associated Press.