The city warned private organizations Friday not to attack nightclubs and other controversial businesses during Ramadan.

"The Jakarta police chief has made it quite clear that unauthorized mass organizations are not permitted to perform supervisory functions," said Arid Budhiman, who heads the Jakarta tourism and culture office.

Enforcement can only be handled by police, the city government's security and order agency, and his office, Budhiman added.

"If mass organization members notice night spots that operate outside the officially permitted hours, they should report the spots to the authorities," he said.

Budhiman said his office had sent notices to 1,129 bars, clubs, massage parlors, nightclubs and karaoke operators in early August, detailing which of them have to close during the fasting month and which can operate with time limits.

Nightclubs, massage parlors and saunas are supposed to close for the month. Karaoke and live music spots may only operate from 8:30 p.m. to 1:30 a.m.

Entertainment venues at star-rated hotels can stay open, however, in a nod to the city's tourism industry.

In the past, hard-line Islamic organizations have attacked such businesses for operating during Ramadan.