Tony Blair announced new Home Office powers today that will end Britain's tradition of giving safe haven to foreign radicals and will allow foreigners accused of inciting extremism to be summarily deported.

At his regular Downing Street press conference, the Prime Minister also announced that two Islamic groups, including Hizb Ut-Tahrir, would be banned and said that Parliament could be recalled in September - a month early - to start pushing through new anti-terrorist legislation.

Mr Blair said the measures were a direct response to the changed changed security climate after the July 7 and 21 bombing attacks on London. They included drawing up a list of extremist websites, bookshops and organisations, involvement with which could be a trigger for deportation. Similar lists could be used to deny entry or asylum to those arriving.

The killing of 52 London commuters by four suicide bombers on July 7 has prompted condemnation of Britain's liberal policies that allowed Islamist radicals to gather in "Londonistan".

"Anyone who has participated in terrorism or has anything to do with it anywhere will automatically be refused asylum in our country," Mr Blair said. "Let no one be in any doubt that the rules of the games are changing."

Most of the new measures will be administrative, allowing the Home Secretary to decide who should be deported. They will be backed up by controversial agreements with some ten Middle Eastern and North African countries designed to ensure that deportees are not tortured or mistreated.

The Prime Minister said that legislation would be drafted to back up the new measures, including, for instance, a possible rewriting of the Human Rights Act.

That Act enshrines in UK law the European Convention on Human Rights, but Mr Blair said that it might need to be redrafted to change its interpretation of the European rules to allow "non-suspensive appeals" against deportation, under which appeals are only heard after deportation. Some other European countries already operate similar policies on deportation.

Just as controversial is a proposed new offence of "glorifying, condoning or justifying terrorism", which civil rights group Liberty said would be a "dangerously broad speech offence".

The new measures could lead to the deportation in the next few months of dozens of foreign Muslims, including some of the country's best known Islamic clerics. Mr Blair would not be drawn on how many deportations he expected, except to say "more than a handful".

He read out a list of 12 specific measures and proposals, including banning Hizb ut-Tahrir, a radical Islamic organisation whose call for a global Islamic caliphate has attracted thousands of young British Muslims. Hizb ut-Tahrir, which describes itself as a non-violent organisation even though it considers Palestinian suicide bombers "martyrs", accused Mr Blair of "stifling legitimate political debate" and said it would fight the ban in the courts.

The successor organisation to the disbanded Al Muhajiroun, run by the radical cleric Omar Bakri Mohammed, will also be placed on the proscribed list.

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