ONE of the men suspected of Drummer Lee Rigby's murder took part in a protest over the arrest of a Muslim man by anti-terror police, two months before the Glasgow Airport attack in 2007.

Michael Adebolajo can be clearly seen on TV footage of the protest involving campaigners led by Anjem Choudary, the former leader of the banned Islamic group Al Muhajiroun, outside London's top-security Paddington Green police station.

The rally in April 2007 followed the arrest of Rajib Khan at his home in Luton, Bedfordshire. Five other men were also being held, suspected of incitement to commit terrorism overseas and terrorist fund-raising.

On Wednesday, Adebolajo ranted in a video after the killing of Drummer Rigby. Clutching bloodied weapons including a meat cleaver, he claimed the killing was carried out in the name of Allah.

Mr Choudary said Adebolajo had been linked to the group, but had since gone his own way.

Following a meeting of the Cobra emergency response committee, Prime Minister David Cameron would not comment on the fact that Adebolago and the other suspect, who has not been named, were known to security services. He said: "What happened in Woolwich has sickened us all. The point that the two suspects in this horrific attack were known to the security services has been widely reported. You would not expect me to comment on this when a criminal investigation is ongoing."

Deputy Prime Minister Nick Clegg came under pressure to drop objections to the so-called Snoopers' Charter amid claims it could have helped prevent the murder in Woolwich. A number of former Labour ministers expressed concern the plans had been abandoned.

The Communications Data Bill was dropped from last month's Queen's Speech in the face of Liberal Democrat opposition.

Labour's former home secretary Lord Reid and the party's former security minister Lord West both warned the Woolwich attack was evidence the security services needed the tools to counter extremists.

Meanwhile, Scotland Yard has rejected suggestions it took 20 minutes for officers to reach the scene. Assistant Commissioner Simon Byrne said officers were there within nine minutes.