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Meanwhile, the Muslims have set up a tent outside the building where they meet for daily prayers.

“We don’t give up,” Mr. Beslija said. “Young people will continue to join our group whether there is a Koran school in Moenchengladbach or not.”

It has no trouble getting out its message on the Internet and reaching Web-savvy young immigrants who do not understand local Arabic-speaking imams.

The group has conducted several recruitment drives in Hilden, Moenchengladbach’s neighbor, according to Mr. Assila, the town’s intercultural adviser.

He said Mr. Hilden has reacted by bringing its immigrant leaders into a project to fight extremism. But in the long run, he said, the most important thing is for young immigrants not to feel excluded from mainstream German society.

“These kids get discriminated against every single day,” said Mr. Assila. “As long as they don’t belong to German society, they will continue to look for a different kind of community that makes them feel welcome.”