LONDON - British politicians today warned that giving police the power to hold terror suspects for three months without charge could erode civil liberties but said they were united in their determination to fight terrorism.

Prime Minister Tony Blair met with opposition party leaders to discuss new anti-terror legislation aimed at preventing a repeat of July 7 bombings that killed 52 people.

Meanwhile, police questioned five suspects arrested in connection with the July 21 failed attacks on the London transit system. They have released the names of two of the four suspected bombers, who are being sought, and provided details on how they fled three subway trains and a bus when their devices failed to fully detonate.

Those bombs were stored in clear plastic food containers and put into dark-colored bags or backpacks. Peter Clarke, head of the Metropolitan Police anti-terrorist squad, said those four bombs were similar to another found abandoned in a park on Saturday, raising fears a fifth bomber was on the loose.

Opposition leaders did not think they would have to reconvene Parliament in summer, instead of October as planned, to discuss new terrorism legislation.

Under discussion are proposals to outlaw "indirect incitement" of terrorism, including praising those who carry out attacks, to counter extremist Islamist clerics accused of radicalizing disaffected Muslim youth in Britain.

The law also would make it illegal to receive training in terrorist techniques in Britain or abroad, or to plan an attack and activities such as acquiring bomb-making instructions on the Internet.

"There's a great desire at a time when the country faces such great danger to work together. We are all in this together and we all believe it is very important to show that the country is united in its response to the danger we face," Conservative leader Michael Howard said. "We hope that it will be possible to reach agreement on further measures that will enable us to deal with this threat more effectively."

The opposition leaders, however, had reservations about a police proposal to extend the time that a terror suspect can be held without charge from two weeks to three months.

"We see very considerable difficulties in that. That is a long time to hold someone without charge, and possibly just release them after that," Howard said.

The leader of the Liberal Democrats, Charles Kennedy, agreed.

"We have to make sure that we go about this in a measured way and that we don't surrender basic civil liberties," Kennedy said. "We have reservations about a possible extension on holding people for questioning."

Clarke identified two of the suspects as Yasin Hassan Omar, 24, and Muktar Said Ibrahim, 27, also known as Muktar Mohammed Said, but did not give their nationalities.

He also released new closed-circuit images of the four suspects and gave details of their movements, saying one bolted from a subway station pursued by passengers, while another jumped through a subway window and fled down the tracks.

Armed officers on Monday raided a London apartment that Said - suspected of trying to bomb a bus in east London on Thursday - was believed to have visited recently. Forensic officers in white overalls searched the apartment in Curtis House, a concrete high-rise in the city's northern suburbs.

Metropolitan Police also said Monday they had arrested two people on suspicion of terrorism in the area but not at the raided address. Three other suspects are already being questioned at a high-security London police station "on suspicion of the commission, instigation or preparation of acts of terrorism" in connection with the July 21 attacks.

On Sunday, police destroyed a package found in bushes in a west London park not far from the scene of the attempted bombing at Shepherd's Bush Underground railway station. Clarke said forensic examination had shown "clear similarities" between the device and the bombs found on three subway trains and a bus last Thursday.

"All five of these bombs had been put into dark-colored bags or rucksacks. All five were made using the same type of plastic food storage container," Clarke said. He appealed for shopkeepers who stocked the 6.25 liter (1.65 gallon) clear plastic containers to contact police if they had sold five or more of the containers.

They are not indicative of any particular terrorist organization's techniques, said Brian Jackson, a specialist in terrorist technology at Washington's Rand Corp., a think-tank that conducts national security research.

"There's certainly a lot of flexibility in the way people can make bombs, so most likely this was just something that was a convenient size for the type of bomb," he said.

Police Commissioner Ian Blair said police were mounting "an absolutely brilliant operation, and it is, of course, racing against time."