Kuta (Indonesia): Australian Prime Minister John Howard warned on October 18 during a visit to the Bali bomb scene that more terrorist attacks were likely, as Indonesia prepared to introduce sweeping anti-terrorism measures.

Western countries have already begun withdrawing diplomats from Indonesia and many have issued new travel warnings following the bombing six days ago which killed more than 180 people and injured many more.

Under intense pressure to crack down on radical Islamic groups blamed for the carnage, Indonesia has ordered firebrand Muslim cleric Abu Bakar Bashir to turn himself in for questioning on October 19.

Indonesian President Megawati Sukarnoputri is also expected to sign a decree on October 18 giving the authorities wide powers to clamp down on terrorist suspects, including detention without trial for up to a year.

Looking grim, Howard on October 18 inspected the twisted wreckage of the bomb-site in the tourist area of Kuta which has been searched by police experts from Australia, Britain, Germany and the United States.

The Australian leader, who held an emotional sunset memorial service with relatives of victims in Bali on October 17, warned his citizens that bombings the previous day in the Philippines pointed to a grim reality.

"I think further terrorist attacks in the region are very likely," he told an Australian radio station from Bali, while insisting that Western -- rather than Australian -- targets were being singled out.

A majority of the victims were Australian tourists, and Howard said his government was determined to hunt down the perpetrators of the attack, which has been blamed on the al-Qaida network and local allies.

"It is the hardest week we've had in decades," he said. "It's the biggest loss of Australian life outside of war in a single incident."