British police are investigating the attempted abduction of a serviceman at a Royal Air Force base in eastern England and say they haven't ruled out terrorism.
The serviceman, aged in his late 20s, was jogging on Wednesday and not in uniform when he was approached by two men at RAF Marham, one of whom shouted at him and tried to grab him.
He fought off the attacker and the second man, who was armed with a knife, went to help his accomplice at which point the serviceman ran off. He was unhurt.
"I can confirm we are treating this as an attempted abduction and detailed enquiries are being carried out at the scene to establish the full circumstances," said Detective Superintendent Paul Durham
"The motivation for the attack remains unclear at this time, and whilst we are currently unable to discount terrorism, there are a number of other possible hypotheses."
The two men were described by police as being aged between 20 and 30 and of Middle Eastern origin in appearance.
RAF Marham is home to Britain's Tornado GR4 Force which is involved in operations in the Middle East.
In May, Junead Khan, 25, a supporter of the Islamic State (IS) militant group, was jailed for life for plotting to kill US troops based in eastern England, while in April two Britons, inspired by IS, were imprisoned for planning to kill police and soldiers in drive-by shootings in London.
In 2013, British soldier Lee Rigby was hacked to death on a street in London in broad daylight near his barracks. Two British Muslims were later found guilty of his murder.