Police have been given more time to question a former Shrewsbury doctor arrested in connection with the failed terror attacks in London and Glasgow.Anti-terror police were given until Saturday to continue questioning Dr Mohammed Asha. The 26-year-old, from Newcastle-under-Lyme, was arrested on the M6 motorway in Cheshire on June 30.

Dr Asha worked as a junior doctor at the Royal Shrewsbury Hospital until August last year. It is believed he also worked at Telford’s Princess Royal Hospital during that time.

Over the weekend, police in Britain released two people arrested over the failed attacks. Two trainee doctors, aged 25 and 28, were released without charge yesterday after being held since their arrest at the Royal Alexandra Hospital, Paisley, in the early hours of July 2.

A third person has been charged over the attacks. He is Iraqi doctor Bilal Abdullah, 27, who is accused of conspiring to cause explosions. He is due to appear at the Old Bailey on July 27.

Meanwhile, the Government today increased the pressure for an extension of the 28-day limit on the detention of terror suspects when Gordon Brown’s new security minister set out the “dramatic” level of the home grown terrorist threat.

Former Royal Navy Chief Admiral Lord West said the police and security services were currently monitoring about 2,000 suspects and a further 2,000 loosely linked to them.

And he said about 30 gangs were thought to be making active preparations for an attack of some sort.

Lord West said he wanted to see an extension of the 28-day limit which was introduced in 2005 when MPs rejected a bid by Tony Blair to introduce a 90-day limit.