An urgent review of how NHS doctors are recruited from overseas in the wake of the terrorist attacks on Glasgow and London.

An urgent review of how NHS doctors are recruited from overseas in the wake of the terrorist attacks on Glasgow and London was announced by Prime Minister Gordon Brown yesterday.

The move came as the national terror threat level was reduced from critical to severe for the first time since the attempted car bomb attacks on London and Glasgow Airport. Speaking during his first session of Prime Minister's Questions in the Commons, Mr Brown said the government will also expand the worldwide "watch list" of potential terrorists to help warn other countries.

Home Secretary Jacqui Smith, who announced the reduction in the terror threat level in a statement, said there was "no intelligence" to suggest another terrorist attack was imminent.

After a series of arrests in the UK and Australia in recent days, it appeared yesterday that the phase to round up the suspects in the fast-moving inquiry was drawing to a close .

Six people continued to be questioned last night at the high security Paddington Green police station in London following the Glasgow attack on Saturday and the two failed car bombs found in the west end of London.

One man, named as Khalid Ahmed, remains critically ill with severe burns at the Royal Alexandra Hospital in Paisley, where it is believed he worked as a doctor.

Among those being questioned in London is Sabeel Ahmed who was arrested in the Lime Street area of Liverpool on Saturday.

Dr Ahmed studied at the Rajiv Gandhi University of Health Sciences, in Bangalore, the home city of Dr Mohammed Haneef, 27, who was detained and is now being questioned in Brisbane, Australia. The majority of those held are linked to the NHS as doctors or trainee doctors while the only woman arrested is a trained laboratory technician.

Canon Andrew White, a British cleric working in Baghdad, claimed an alleged al Qaeda leader in Iraq warned him of the attacks. Mr White said the man claimed "those who cure you will kill you", an apparent reference to the NHS link.

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