Indonesia was in a state of high alert Thursday after the arrest of 19 terror suspects led police to a 150-kilogram (330-pound) bomb buried beneath a gas pipeline near a church. Senior security minister Djoko Suyanto said he believed Islamic militants had been plotting an attack outside of the capital during Good Friday celebrations. "The army and police are under high alert," he told reporters after attending a meeting chaired by President Susilo Bambang Yudhoyono. "We want to guarantee safety." Indonesia, the world's most populous Muslim nation, was thrust onto the front lines in the battle against extremists in 2002 after al-Qaida-linked militants attacked two nightclubs on Bali island, killing 202 people, many of them foreign tourists. There have been several attacks since then targeting glitzy hotels, restaurants and an embassy, killing another 60.