7:56am UK, Thursday July 14, 2005

One of the bombers who brought carnage to London taught disabled children, it has emerged.

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Mohammed Sadique Khan pictured teaching

Mohammed Sadique Khan, 30, of Dewsbury, was a supply teaching assistant who taught disabled children in Beeston, it has been revealed.

A picture of him carried on the front page of The Times shows the bearded bomber caring for young children at the school.

The news came as police told Sky News they were hunting a fifth man involved in the plot to kill 52 people in Britain's first suicide strikes.

Sky News' crime correspondent Martin Brunt said: "Police have to assume that there were others working with these four."

The Times reported that the mastermind of the attacks was a Pakistani in his 30s who arrived through a British port last month but left a day before the bombings.

Detectives are piecing together the lives of  the suicide bombers - four home-grown young men.

Three of the four bombers are believed to be Shehzad Tanweer, 22, of Leeds, Mohammed Sadique Khan, 30, of Dewsbury, and Hasib Hussain, 19, of Leeds.

A fourth man from Yorkshire has been identified by police but not yet named.

He is believed to have been on the train which was devastated near Russell Square Tube station and is thought to be a friend of the other three suspects.

Bashir Ahmed, 65, the uncle of Shehzad Tanweer, said: "The family is shattered. This is a terrible thing."

Mr Ahmed said it was hard for the family to accept their son had caused such loss of life, adding: "It wasn't him. It must have been forces behind him."

Meanwhile, police have raided homes in Aylesbury, Buckinghamshire.

Brunt said police had received a tip-off that they might find explosives in a home.

In other related news:

:: Italy has arrested and is questioning 174 Islamic extremists.

:: It is thought that the explosives originated in the Balkans, where it is possible to buy the material on the black market after teh Balkan wars.

:: The entire European Union will hold two minutes' silence at noon tomorrow in response to last week's London terror attacks.

:: Security services fear there could still be a second suicide bomb team waiting to strike and that any al Qaeda mastermind may have already fled the country.

:: Police are now focusing efforts on Leeds, where homes have been raided, and Luton, where two cars thought to have been used by the suspects were found.

:: A house being searched by police in Leeds was being used as an operational base for the suspected bombers, according to a local MP.

:: One of the men had been reported missing by his mother after the attacks, apparently worried he may have been caught in the tragedy.

:: Friends of another man said he had travelled to Afghanistan and Pakistan within the last six months, prompting fears he may have attended an al Qaeda training camp.

:: A relative of one of the men was arrested in West Yorkshire and is being quizzed by the anti-terrorist branch after police were given more time to question him "on suspicion of the commission, instigation or preperation of acts of Terrorism under the Terrorism Act 2000".