Prime Minister Tony Blair, responding to last month's deadly bombings in London, outlined a series of unprecedented steps that would allow Britain to deport and exclude foreign nationals who promote or incite extremist violence or are "fostering hatred."

Among those excluded would be non-citizen clerics "not suitable to preach." In addition, Blair said the government was preparing orders allowing the government to shut down places of worship used as centers for "fomenting extremism."

Some of the steps may require legislation or court involvement. Others can be done by government order. Blair acknowledged the potential controversy that could arise from the proposals.

"The rules of the game are changing," Blair said in an 80-minute news conference devoted almost entirely to the issue of terrorism, which has taken on new urgency in Britain since a July 7 bombing that killed four bombers and 52 other people and injured 700 more.

Blair noted that Britain has been generous in hosting asylum seekers and refugees from across the globe, but he said that public opinion is demanding more care in accepting them.

"We're angry about these extremists," Blair said. "We're angry about them abusing our good nature and out toleration."

Blair announced that two Islamic organizations, Hizb ut-Tahrir and al-Muhajiroun, would be banned in Britain.

Leaders of Hizb ut-Tahrir, which has also been banned in Germany, have denounced the bombings and asserted that they are nonviolent.

Al Muhajiroun's spiritual leader is Sheikh Omar Bakri Muhammed, a Syrian-born imam who has expressed "understanding" for the bombings because of Blair's policies in Iraq and the Middle East.

Blair said he was not trying to undermine religious tolerance or "legitimate political debate," but rather he wanted to remove those who are "actively engaged in inciting" people to violence.

He denounced as "appalling rubbish" the opinions of those who have supported the bombings as legitimate expression of Muslim anger at the policies of Britain and the United States.

Blair said some of the new policies would be implemented immediately while others are under "urgent examination."

Britain's home secretary would be empowered to deport or exclude anyone "fostering hatred, advocating violence to further a person's beliefs or justifying or validating such violence."

Blair said there will be a list drawn up of "specific extremist Web sites, bookshops, centers, networks" and organizations and that "active engagement" with any of them would be a "trigger" for possible deportation.

As outlined in a release from the Prime Minister's Office | http://www.number-10.gov.uk/output/Page8041.asp, the government will propose new anti-terror legislation that will create an offense of "condoning or glorifying terrorism . . . anywhere, not just in the UK."

"Anyone who has participated in terrorism or has anything to do with it anywhere will automatically be refused," said the statement.

Blair also said the government would:

{sstar}Consider stripping citizenship from naturalized Britons "engaged in extremism."

{sstar}Establish, within the Muslim community in Britain, a commission to advise on how to better integrate into society "those parts of the community presently inadequately integrated."

{sstar}Consider closure of places of worship used as centers "for fomenting extremism" and, in consultation with Muslim leaders, "draw up a list of those not suitable to preach who will be excluded from Britain."

Fred Barbash reported from Washington.