JAKARTA (AFP/Reuters) - Suspected Jemaah Islamiyah splinter group suicide bombers detonated high-explosive devices in two luxury Jakarta hotels popular with foreigners Friday, killing at least nine people and wounding dozens, officials claimed. Eight Americans were among the dozens of people wounded in bomb blasts at two luxury hotels in Jakarta, the US State Department said. State Department spokesman PJ Crowley said no Americans were killed in the attacks on the JW Marriott and Ritz-Carlton hotels in Jakarta. Witnesses described grim scenes with bloodied survivors fleeing in panic from the Ritz-Carlton and JW Marriott hotels, as terrorism returned to the worlds most populous Muslim nation after four years without a major attack. The broad streets of the Indonesian capitals financial district were littered with glass and debris and smeared with blood after the breakfast-time bombings, which sent a huge plume of smoke over the city. A sombre-looking President Susilo Bambang Yudhoyono, whose crackdown on the Jemaah Islamiyah (JI) network appeared to have quelled the extremist threat, said the bombings undermined the security of the entire nation. He said the attackers have no humanity and they dont care about the damage done to our country with this act of terrorism, which will have wide effects on our economy, trade, tourism and image in the eyes of the world. US President Barack Obama condemned the bombings and offered Indonesia help in the recovery effort. Officials said more than 40 other people were injured when two blasts shook the upmarket hotels, and pinned suspicion on a JI splinter group led by Malaysian-born bomb-maker Noordin Mohammed Top. Based on the evidence at the scene, we found that there were two suicide bombers, national police chief Bambang Hendarso Danuri told reporters. Grainy security camera footage at the Ritz-Carlton showed a man wearing a backpack on his chest and carrying a suitcase entering the hotel restaurant moments before a bomb exploded. At least one foreigner, a New Zealand businessman, was confirmed dead and Australian Prime Minister Kevin Rudd said he had grave concerns for three missing Australians including an embassy official. The Marriott was hit in 2003 by a blast that killed 12 people, and Fridays violence bore the hallmark of past attacks blamed on the Al-Qaeda-linked JI both in Jakarta and the tourism hotspot of Bali. National police spokesman Nanan Soekarna confirmed at least nine people were killed and 41 were injured, including 14 foreigners, when the blasts struck around 8:00 am (0100 GMT). Despite security measures in place at Jakartas top hotels, including vehicle searches and metal detectors, police said one blast hit the basement of the Marriott and a second the restaurant of the Ritz-Carlton. An unexploded bomb was later found and defused by police in room 1808 of the Marriott, presidential adviser Djali Yusuf said. Officials said seven people were killed at the Marriott and two others at the Ritz-Carlton. Three Dutch citizens, a South Korean man and a Japanese national were said to be among the foreigners injured.