Abu Ibrahim, a lanky 24-year-old, was on [a suicide bomb] mission when he left this bleak city north of Amman for Iraq last October. But he made it only as far as the border before he was arrested, and is now back home in a world he thought he had left for good — biding his time, he said, for another chance to hurl himself into martyrdom.

“I am happy for [his friends who died carrying out suicide attacks in Iraq] but I cry for myself because I couldn’t do it yet,” said Abu Ibrahim, who uses this name as a nom de guerre. “I want to spread the roots of God on this earth and free the land of occupiers. I don’t love anything in this world. What I care about is fighting.” [...]

Interviews with Abu Ibrahim and relatives of the other men show that rather than having been individually recruited by an organization like Mr. Zarqawi’s, they gradually radicalized one another, the more strident leading the way. Local imams led them further toward Iraq, citing verses from the Koran to justify killing civilians. The men watched videos depicting tortured and slain Muslims that are copied from Internet sites. [...]

“Most of the young people here in Zarqa are very religious,” an Islamist community leader said. “And when they see the news and what is going on in the Islamic countries, they themselves feel that they have to go to fight jihad. Today, you don’t need anyone to tell the young men that they should go to jihad. They themselves want to be martyrs.”

The anger is palpable on the streets of Zarqa. “He’s American? Let’s kidnap and kill him,” one Islamist activist said during an interview with a reporter before the host of the meeting dissuaded him.

The stories of the men from Zarqa help explain the seemingly endless supply of suicide bombers in Iraq, most of whom are believed to be foreigners. [...]

The anger among militants in Zarqa, a mostly Sunni city, is now directed at Shiites as much as Americans, reflecting the escalation in hostility between the two branches of Islam since Shiites gained dominance in the new Iraqi government. “They have traditions that are un-Islamic and they hate the Sunnis,” said Ahmad Khalil Abdelaziz Salah, an imam whose mosque in Zarqa was attended by some of Zarqa’s bombers.

Asked to name his targets, Abu Ibrahim said: “First, the Shiites. Second, the Americans. Third, anywhere in the world where Islam is threatened.”

(cont.)