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President Obama and Secretary of State Hillary Rodham Clinton expressed serious concerns.

“Indonesia has been steadfast in combating violent extremism and has successfully curbed terrorist activity within its borders,” Mr. Obama said. “However, these attacks make it clear that extremists remain committed to murdering innocent men, women and children of any faith in all countries.

“The American people stand by the Indonesian people in this difficult time, and the U.S. government stands ready to help the Indonesian government respond to and recover from these outrageous attacks as a friend and partner,” Mr. Obama added.

U.S. and Indonesian authorities have put enormous pressure on JI in recent years, resulting in a decrease in attacks, but reports that JI has been dismantled were “a false assumption,” the U.S. counterterrorism official said.

“Bottom line is: JI remains a threat, and we’re chasing down every possible lead,” the official added.

In October 2002, the group was responsible for a triple bombing in Bali that killed more than 200 people at nightclubs.

In Friday’s attacks, the terrorists evaded metal detectors and vehicle inspection checkpoints in place since previous bombings.

The Associated Press reported that hotel X-ray machines, set up to detect bombs, did not reveal dangerous material hidden in the luggage of the bombers, who apparently brought in the various components of the bombs at different times.

JI used to have several hundred members across Malaysia, Indonesia, the Philippines, Thailand and Australia. The group, allied with al Qaeda, received military training and sought to build an Islamic state.

During the 1980s, 60 Indonesian and Malaysian members of the group reportedly traveled to Afghanistan to aid anti-Soviet Mujahadeen fighters. Some attended al Qaeda training camps and developed close ties with the organization.