Police have found explosive materials in a north London flat where two of the suspected would-be suicide bombers lived on housing benefit.

The materials have been taken away from the flat in Curtis House, a 13-storey council block in Bounds Green, for forensic tests, a Met spokesman confirmed.

Today officers also seized a car about two miles away in East Finchley, Scotland Yard said. The car was impounded in connection with the attempted bombings of July 21.

Meanwhile the Home Office have revealed that the man wanted for trying to blow up a bus last week had a British passport.

Muktar Saed Ibrahim, also known as Muktar Mohammed Saed, became a British citizen last September.

Both he and Yassin Hassan Omar, the suspected would-be Warren Street Tube bomber, have been in the UK since 1992.

They were granted "exceptional leave to remain" as dependants of asylum seekers, a Home Office spokesman said.

Muktar Saed Ibrahim fled from Eritrea at age 14 and applied for British citizenship in November 2003.

Yassin Hassan Omar was 11 when he came from war-torn Somalia and received indefinite leave to remain in May 2000.

He was the registered occupant of the flat in Curtis House, a spokesman of Enfield council said.

For more than five years, since February 1999, he has received housing benefit to pay the rent.

Muktar Saed Ibrahim lived with him for the last two years.

In another development, police have been granted permission to question a man arrested at the weekend in Tulse Hill, south London, until tomorrow.

Five men are in custody in connection with the second wave of attacks, but police are still hunting the bombers.

A sixth man, hotel porter Adnan Abdelah, have been charged with wasting police time in the attempted bombing investigation.

Last Friday the 24-year-old, of Bromley-by-Bow in east London, reported to the British Transport Police office at Tottenham Court Road Tube station.

Hours of inquiries showed he was not involved in the second wave of attacks.

The porter also faces a charge of possessing a forged French ID card and will appear at Bow Street magistrates' court tomorrow.

Tonight the Casualty Bureau, which helped to trace victims of the 7/7 attacks, will close, as all the casualties have been identified.

The bureau at Hendon received more than 121,000 calls from worried loved ones.