INVESTIGATORS believe a man brought up in Huddersfield was the key co-ordinator of the London suicide bombings.

Anti-terrorist detectives think Jermaine Lindsay, 19, may have been the most senior of the four bombers.

An unconfirmed report today said he had been on a "watch list".

Lindsay, who has still not been officially named by police, is believed to have been responsible for the Russell Square blast, which killed at least 26 people.

The three other bombers travelled from West Yorkshire to meet him in Luton.

Lindsay, who was living in Aylesbury, Buckinghamshire, is reported to have attended a radical mosque in London with Robert Reid, the Muslim convert jailed in the US for trying to blow up a plane with a bomb in his shoe.

Lindsay's wife today refused to accept that her husband could have carried out a murder mission.

Samantha Lewthwaite, 22, is reported to be struggling to understand how Jamaican-born Lindsay could have caused the deaths.

Ms Lewthwaite, who has a 15-month-old son Abdullah with Lindsay and is pregnant with the couple's second child, is said to be under police guard in hospital.

She said: "He was lovely and we were just perfect together."

The former Aylesbury Grange Secondary School pupil is reported to have said she will not believe her husband was involved in the bombings until there is DNA proof.

She said: "He wasn't the sort of person who'd do this. I won't believe it until I see proof."

She added: "I'm not going to accept it until they have his DNA."

Scotland Yard has confirmed it has now identified 41 victims of the attacks, although police have only named 31 so far.

A total of 54 people are so far thought to have died.

Cairo police were today still questioning an Egyptian biochemist about the bombings.

Magdy el-Nashar, 33, had recently had been teaching chemistry at Leeds University.

He is thought to have rented one of the homes police searched in Leeds in a series of raids on Tuesday.

He was taken into custody on his arrival in Cairo from abroad.

An Egyptian official could not say where el-Nashar was arriving from, but said it could be as long as a week ago.