Police only have 24 hours left to question a Letchworth man arrested on suspicion of terrorism offences before taking further action.

The man, in his 20s, has been held in custody since he was arrested by the Metropolitan Police last Tuesday in the town at about 12.45pm.

Several national newspapers reported that he shouted “cowards” at the officers and that he was detained outside Alliance Healthcare in Avenue 1.

He was arrested along with two other men, one in his 30s and the other in his 20s, in Luton on suspicion of the same offence.

Yesterday the man in his 30s was released without charge.

On Wednesday the police were given permission to question the men for another seven days at Westminster Magistrates’ Court, this runs out tomorrow. At this point the police can either charge the men with a crime, apply for more time to question them or release them.

The arrests were part of an ongoing investigation into Islamist-related terrorism.

A spokesman said: “As this is an active investigation, officers are not releasing any further information at this stage.”

Under the Terrorism Act, a person can be held for up to 14 days before they are released or charged.