Nisar Ahmed feels close to his four sons, who often travel to his native Pakistan. So close, he said, that he's never had any reason to suspect they would secretly visit a terrorist training camp or enroll at a radical Islamic school. But that was before the London bombings.

Now, Ahmed is taking no chances. The next time his sons, ages 27, 28, 30 and 31, fly there, he said, he's going to question them: Are you really going to that wedding? Are you really planning to see the relatives? If he can, he will restrict where they go inside Pakistan -- a measure that other fathers are also planning to take, he said.

"All parents are going to make sure their children stay in their village or in the city where they come from," Ahmed said in a firm voice.

As the focus of investigations into the July 7 bombings and last week's botched attacks in London shifts outward to such places as Birmingham and Rome, many of the besieged Muslims of this city's Beeston neighborhood are looking inward.

For the first time, they said, they are taking a hard look at their own community, which police said produced three of the four men who died in the July 7 attacks.

Some are struggling to understand how their young people were drawn into fanaticism, and are trying to take action to prevent a recurrence. Others are stuck at the opposite extreme: They are unconvinced that the three men were suicide bombers, as has been widely reported, and suggest they may have been duped into carrying bombs.

Whatever their view on this question, members of the older generation in Beeston tend to share a collective dread of their future in Britain, a fear that the attacks may have stained their community irreversibly. "They feel that 50 or 60 years of hard work is going down the drain," said Mohammed Arshed, a social worker and community elder in Beeston.

The three local men whom police have identified as July 7 bombers -- Shehzad Tanweer, 22, Mohammed Sidique Khan, 30, and Hasib Hussain, 18 -- all came from Pakistani immigrant families. Authorities are investigating whether they received terrorism training during visits to Pakistan last year. Their families have said they believed they were visiting relatives and studying how to pronounce the Arabic in the Koran, Islam's holy book.

"It could have been any of our children," said Ejaz Hussain, the owner of a corner shop who knows the parents of two of the bombers.

Community elders have come under pressure to erase their area's sudden notoriety as a breeding ground for terrorism. They have held public meetings with police officers and pledged to cooperate fully with the police probes. They have organized peace marches to show their solidarity against terrorism. Parents of the bombers have expressed their condolences to victims and their families.

At the white-walled Hardy Street mosque this week, Sarwar Khan, an elder, took two journalists on a tour. He pushed open a green door and stepped into a room filled with young girls, all wearing traditional Islamic head scarves and reciting from Arabic textbooks in Yorkshire accents.

He insisted the school isn't a madrassa, or Islamic school. In Pakistan and other Muslim countries, extremist madrassas often teach children hatred of the West. The girls were studying Arabic and the Koran because they couldn't study them in the British school system, he said. "This is all very basic -- like learning your ABCs," said a smiling Khan, secretary of the Kashmir Muslim Welfare Association, which runs the mosque.

Then he went downstairs to the basement and stepped into a dusty room with treadmills, a bike machine and a ping-pong table. This was the gym where the bombers once pumped weights together. Now, said Khan, the mosque's members are more vigilant.

"We know who is coming and what they are doing," Khan said. "It's like a wake-up call, not just here, but to every Muslim parent, to make sure they watch over their children, know where they are going and what they are being taught."

Arshed agreed. As he sat inside a community center, eating a lunch of curry and rice, he spoke of how Pakistani parents rarely attend parents-night programs at local schools. "They are too busy making money," he said, shaking his head. "Parents need to take more interest."

But he also argued that some of the solution rests with the government. It needs to integrate young Muslims disaffected by high unemployment, substandard living conditions and a deep mistrust of the system.

"If, for example, Islamic teachings were sufficient at school, not only could those teachings be monitored but kids wouldn't feel the need to go to madrassas," said a close relative of Tanweer, who spoke on condition her name not be used.

None of this, said Arshed, could erase anger over the global suffering of Muslims that many believe helped fuel the bombings. Only a change in Britain's unflinching support for the U.S.-led wars can accomplish that, he said. "What's happening in Afghanistan and Iraq is making the Muslim community lose fear of death," Arshed said.

Seated next to him, on the other side of the small table at the community center, Saeed Ahmed nodded his head in agreement. He also said he continues to wonder about the assertions that the bombings were suicide attacks.

Why would the bombers buy round-trip tickets to London if they planned to kill themselves there? Why would one bomber buy parts to repair his Honda Civic two days before the attacks? "Maybe they didn't want to blow themselves up," said Ahmed, who is not related to Nisar Ahmed and was Tanweer's friend.

In Beeston, this is a vital distinction for many people, young and old. If the men weren't suicide bombers, they feel, maybe they were just carrying the bombs for someone else, perhaps without knowing it. This would mean that their community is not an incubator for extremists.

"Were they suicide bombers or were they set up?" Arshed asked. "There are still these questions in the mind of the community. There are so many questions that are unanswered."

A mixed faith delegation from the Beeston community in Leeds holds a remembrance service in London for victims of the July 7 attacks.