Koran burning outrage builds as Muslims mark Idd

"This threatens peace and international security. This is something that endangers harmony among religious people," Yudhoyono said in a nationally televised address marking the end of Ramadan.

"I'm of course aware of the reported cancellation of the deplorable act by Terry Jones. However, none of us can be complacent until such a despicable idea is totally extinguished," he said.

The governments of Pakistan and India, which after Indonesia have the world's biggest Muslim populations, have added their voices to a chorus of global outrage against Jones.

Najib Razak, prime minister of Muslim-majority Malaysia, warned Friday the fraught relationship between the Muslim and non-Muslim worlds would enter "a very dangerous chapter" if the burning went ahead.

"I hope the pastor will have a change of heart because by that single act of abhorrence... it will ignite the feelings of Muslims throughout the world, the consequences of which I fear would be very, very costly," he told reporters.