The British government has announced it is to create a new offence of providing or receiving training in the use of hazardous substances.
It will also cover other terrorist techniques.
The announcement comes after Egyptian authorities confirmed they have arrested an Egyptian man reportedly being sought by British police investigating last week's suicide bombings in London.
The Interior Ministry has named the man as Dr Magdi Mahmoud al-Nashar and say he has strenuously denied any connection with the attacks.
Police in Britain are searching a flat in Leeds where the 33-year scientist had been studying.
He said he had gone to Egypt on holiday.
A senior British Muslim leader earlier said he wanted concrete steps to ensure an atrocity similar to the London bomb attacks never happens again.
Sir Iqbal Sacranie, who is the Secretary-General of the Muslim Council of Britain, was speaking while on a visit to Leeds, where some of the alleged bombers were brought up.
He said Muslims had to face up to the problems of extremism in their own community.
He told a meeting of local Muslims to expect a statement later today from Islamic scholars at the London Central Mosque which, he said, would leave no-one in any doubt about the Muslim community's attitudes to atrocities such as the London bombings.
Warning of possible further attacks
Earlier today, London's Metropolitan Police Commissioner, Sir Ian Blair, gave a new warning of more possible terrorist attacks following last week's bombings.
In a BBC radio interview, Sir Ian said the fact that all four bombers had been killed did not mean that further attacks were less likely.
He also confirmed that police were now concentrating on finding the handlers and bomb-makers who organised the attacks.
The death toll in the bombings has risen to 54, with the death in hospital of a 28-year-old Australian man who had been travelling on the bus which exploded in Tavistock Square.
It has also been reported that the components in the explosive used in the attacks were available from chemist shops, and was not commercial explosive as had been previously thought.
Leeds explosives 'home-made'
Sources now believe explosives recovered from a house raided by police in Leeds were home-made, and similar to that used in previous al-Qaeda attacks.
It is the same as that used by the British shoe bomber, Richard Reid, who tried to blow up a transatlantic airliner.
25 victims have so far been identified, although only 15 have so far been officially named.
Overnight in Leeds, forensic teams and the army bomb squad continued their work at a number of premises thought to have been used by the bombers.
Hundreds of residents have been evacuated from their homes in the surrounding areas.
