A pair of powerful bombs exploded at two luxury hotels in an upscale Jakarta business district Friday, killing 9 and wounding at least 50, officials said.

The blasts at the neighboring Ritz-Carlton and Marriott hotels blew out windows and scattered debris and glass across the street.

An Indonesian security minister said nine people were killed. South Jakarta police Col. Firman Bundi earlier said that four of the dead were foreigners.

At the Metropolitan Medical Center, a list was posted with the names of people wounded. An official at the registration office said 11 were foreigners. She declined to give her name because she was not authorized to speak to the media.

Alex Asmasubrata, who was jogging by the hotels, said he first heard a loud explosion at the Marriott. Five minutes later, a bomb followed at the Ritz.

Indonesian President Susilo Bambang Yudhoyono said the attack was carried out by a “terrorist group” and vowed to arrest the perpetrators. He also suggested a possible link to the national election last week that is expected to hand him another five-year term as president, but he provided no details.

Manchester United football team canceled a planned visit to Indonesia. The team had been scheduled to stay at the Ritz on Saturday and Sunday nights for a friendly match against the Indonesian All Stars, the Indonesian Football association said.

Jakarta police chief Maj. Gen. Wahyono said two homicide bombers carried out the attacks at the hotels. The suspects of the Marriott bombing stayed on the 18th floor, where un-detonated explosives were found after Friday’s twin explosions.

“There were several perpetrators,” he told reporters. “They were disguised as guests and stayed in room 1808.”

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