The Australian government warned its citizens Wednesday that security precautions at Bali's international airport are below international standards.

Australia's travel advisory cited an earlier U.S. finding that Bali's Denpasar airport does not comply with security regulations set by the International Civil Aviation Organization. However, Australian and American authorities say they are working together with the Indonesian government to improve airport security.

Resorts on the island of Bali, Indonesia's most popular tourist destination, have twice been targeted in bombings carried out by Islamic extremists. Many Australians were among the hundreds of people killed in a major attack in 2002 and another suicide bombing in October.

Indonesian security forces have been on heightened alert during the end-of-year holiday period, amid fears of reprisal attacks following a police raid last month that killed a terrorist bombmaker.

Some information for this report provided by AP and AFP.