UTON, England, April 24 — The call to jihad is rising in the streets of Europe, and is being answered, counterterrorism officials say.

In this former industrial town north of London, a small group of young Britons whose parents emigrated from Pakistan after World War II have turned against their families' new home. They say they would like to see Prime Minister Tony Blair dead or deposed and an Islamic flag hanging outside No. 10 Downing Street.

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They swear allegiance to Osama bin Laden and his goal of toppling Western democracies to establish an Islamic superstate under Shariah law, like Afghanistan under the Taliban. They call the Sept. 11 hijackers the "Magnificent 19" and regard the Madrid train bombings as a clever way to drive a wedge into Europe.

On Thursday evening, at a tennis center community hall in Slough, west of London, their leader, Sheik Omar Bakri Mohammad, spoke of his adherence to Osama bin Laden. If Europe fails to heed Mr. bin Laden's offer of a truce — provided that all foreign troops are withdrawn from Iraq in three months — Muslims will no longer be restrained from attacking the Western countries that play host to them, the sheik said.

"All Muslims of the West will be obliged," he said, to "become his sword" in a new battle. Europeans take heed, he added, saying, "It is foolish to fight people who want death — that is what they are looking for."

On working-class streets of old industrial towns like Crawley, Luton, Birmingham and Manchester, and in the Arab enclaves of Germany, France, Switzerland and other parts of Europe, intelligence officials say a fervor for militancy is intensifying and becoming more open.

In Hamburg, Dr. Mustafa Yoldas, the director of the Council of Islamic Communities, saw a correlation to the discord in Iraq. "This is a very dangerous situation at the moment," Dr. Yoldas said. "My impression is that Muslims have become more and more angry against the United States."

Hundreds of young Muslim men are answering the call of militant groups affiliated or aligned with Al Qaeda, intelligence and counterterrorism officials in the region say.

Even more worrying, said a senior counterterrorism official, is that the level of "chatter" — communications among people suspected of terrorism and their supporters — has markedly increased since Mr. bin Laden's warning to Europe this month. The spike in chatter has given rise to acute worries that planning for another strike in Europe is advanced.

"Iraq dramatically strengthened their recruitment efforts," one counterterrorism official said. He added that some mosques now display photos of American soldiers fighting in Iraq alongside bloody scenes of bombed out Iraqi neighborhoods. Detecting actual recruitments is almost impossible, he said, because it is typically done face to face.

And recruitment is paired with a compelling new strategy to bring the fight to Europe.

Members of Al Qaeda have "proven themselves to be extremely opportunistic, and they have decided to try to split the Western alliance," the official continued. "They are focusing their energies on attacking the big countries" — the United States, Britain and Spain — so as to "scare" the smaller states.

Some Muslim recruits are going to Iraq, counterterrorism officials in Europe say, but more are remaining home, possibly joining cells that could help with terror logistics or begin operations like the one that came to notice when the British police seized 1,200 pounds of ammonium nitrate, a key bomb ingredient, in late March, and arrested nine Pakistani-Britons, five of whom have been charged with trying to build a terrorist bomb.

Stoking that anger are some of the same fiery Islamic clerics who preached violence and martyrdom before the Sept. 11 attacks.

On Friday, Abu Hamza, the cleric accused of tutoring Richard Reid before he tried to blow up a Paris-to-Miami jetliner with explosives hidden in his shoe, urged a crowd of 200 outside his former Finsbury Park mosque to embrace death and the "culture of martyrdom."

Though the British home secretary, David Blunkett, has sought to strip Abu Hamza of his British citizenship and deport him, the legal battle has dragged on for years while Abu Hamza keeps calling down the wrath of God.

Also this week, over Mr. Blunkett's vigorous objection, a 35-year-old Algerian held under emergency laws passed after Sept. 11 was released from Belmarsh Prison. The man, identified only as "G," suffered from severe mental illness, his lawyers told a special immigration appeals panel, which let him out of prison and put him under house arrest.

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