A series of powerful bombs ripped through three crowded restaurants in Bali today, killing at least 25 people and wounding more than 100 others - the second time terrorists have brought carnage to the island in three years.
Witnesses reported seeing dismembered bodies at the scene, many of them foreigners.
No one immediately claimed responsibility but suspicion immediately fell on the al-Qaida-linked militant group Jemaah Islamiyah.
Indonesian President Suslio Bambang Yudhyono warned more attacks were possible, and told people to be on alert. "We will hunt down the perpetrators and bring them to justice," he said.
The near simultaneous blasts at two packed seafood cafes on Jimbaran beach and a three-story noodle and steak house in downtown Kuta came days before the anniversary of the October 12 2002 twin bombings on the resort island that claimed 202 lives, many of them foreigners.
Baradita Katoppo, an Indonesian tourist from Jakarta, said one of the bombings occurred in the Nyoman Cafe in Jimbaran, where he was eating dinner with friends.
"I could see other people sustained injuries ... there was blood on their faces and their bodies. It was very chaotic and confusing, we didn't know what to do."
Five minutes later another bomb went off at a neighbouring restaurant, he said.
Sanglah Hospital, near the capital Denpasar, which took over the task of identifying victims, said 25 people were killed and 101 others were being treated at six hospitals.
Among the injured were 49 Indonesians, 17 Australians, six Koreans, three Japanese and two Americans, a hospital official said, adding that the others have yet to been identified.
The Foreign Office has said that one Briton had been treated in hospital for minor injuries received in the blasts. There are no reports of British deaths.
"It's a horrible scene," said a receptionist, Komang, at Graha Asih.
The first bomb appears to have gone off at Jimbaran beach.
"I helped lift up the bodies," I Wayan Kresna told a local radio station. "There was blood everywhere."
Another explosion hit the three-storey Raja restaurant in the busy outdoor shopping centre of Kuta, about 30km (18m) away. Smoke poured from the building, which was badly damaged.
The bomb apparently went off on the second floor of the restaurant, said an Associated Press reporter, who saw three bodies and at least five wounded.
There was no crater outside the building, indicating it was not a car bomb - the device used in three other deadly terrorist attacks that have hit Indonesia in as many years. The devastation was also far less.
The al-Qaida-linked militant group Jemaah Islamiyah has been blamed in the 2002 Bali blasts, and two other attacks in Jakarta that together claimed 23 people - a 2003 attack on the JW Marriott hotel and a 2004 strike on the Australian Embassy.
Western and Indonesian intelligence agencies have consistently warned that the group was plotting more attacks. Last month, President Yudhoyono said he was especially worried the extremist network was about to carry out more bombings.
"I received information at the time that terrorists were planning an action in Jakarta and that explosives were ready," he said today.
Ken Conboy, author of an upcoming book on Southeast Asian terrorism, said today's bombings had all the hallmarks of Jemaah Islamiyah.
"They saw the 2002 Bali bombing as their only true success because it inflicted foreign casualties and the collateral damage weren't Muslims," he said.
· People worried about friends and relatives can call the Foreign Office emergency helpline on 020 7008 8765.