UK authorities say they are searching for two people in the attempted abduction of a serviceman at a Royal Air Force base in eastern England.

Police said Thursday that two men, one of whom had a knife, approached the serviceman while he was jogging. One of the men shouted at the serviceman and attempted to grab him, but the serviceman fought him off and got away.

The incident Wednesday shared some elements of the attack on British soldier Lee Rigby, who was attacked and stabbed to death on a London street in 2013 by two al-Qaida-inspired extremists.

Norfolk Detective Superintendent Paul Durham said the motivation for the attack is unclear and that authorities are "currently unable to discount terrorism," though other hypotheses are possible.