The police chief of Indonesia's capital warned on Saturday that the threat of an attack by al-Qaida-linked militants has increased sharply ahead of US President George W. Bush's visit to the world's most populous Muslim country. Bush arrives Monday for daylong talks with Indonesia's President Susilo Bambang Yudhoyono. Maj. Gen. Adang Firman, police chief of Jakarta, said the threat of a terrorist attack has "escalated sharply" in recent days. He did not elaborate. The regional terror group Jemaah Islamiyah has been blamed for four terror attacks targeting Western interests in Indonesia since 2002. Two attacks in Jakarta and two on the resort island of Bali together killed nearly 240 people, many of them foreign tourists.