DEPOK, Indonesia — Every few months, the head of counterterrorism in the world’s most populous Muslim nation pays a visit to a Koranic academy south of the capital to address an assembly of clerics. His message, he says, is blunt: Stopping would-be bombers “is your job, not mine.”

Ansyaad Mbai’s plea for help is also surprising, given the string of successes against Islamist militants that Indonesian security services have notched in recent years. After a blaze of attacks inspired in part by al-Qaeda’s Sept. 11, 2001, strikes in the United States, the militants in Indonesia are now a battered and diminished force. In just over two years, 33 terrorism suspects have been killed, mostly in shootouts with police, and nearly 200 have been arrested.

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