WASHINGTON (AFP)--Security at two Marriott (MAR)-owned hotels in Indonesia targeted in twin bombings was "very tight" and included measures similar to those used in airports, the Marriott security chief said Friday.

Alan Orlob, in charge of the worldwide hotel chain's security, was staying at the company-owned Ritz-Carlton in Jakarta when it was attacked, along with the city's Marriott hotel on Friday morning.

He told CNN that the attacks came despite the "very tight" security procedures in place at the hotels.

"Every vehicle...is inspected. All luggage is inspected with sophisticated explosive detectors," he said.

"We have walk-through metal detectors at the hotel so nobody can go into the hotel without being screened with a metal detector.

"It is about like going into an airport. It's that type of tight security at the hotels," Orlob said.

But despite the procedures in place, the twin attacks that killed at least nine people and injured dozens appeared to have been organized from within the Jakarta Marriott hotel.

Investigators said they found an unexploded bomb, as well as explosive chemicals and bomb-making materials in room 1808 of the Marriott, which they believe served as a control center for the attackers.

Orlob was in a room on the 23rd floor at the Ritz-Carlton hotel when the first of two bombs exploded across the street at the Jakarta Marriott.

"I looked outside my window... I could see some people start to run around there," he told CNN.

"I guess there was about two minutes later... a second blast and I saw a large smoke puff," Orlob said. "I went down to the lobby of the Ritz-Carlton into the restaurant and I saw where one of the bombs had been detonated."

Suspicion for the bombings has centered on Jemaah Islamiyah, a regional militant Islamist group that was responsible for the 2002 Bali attacks and was the target of a crackdown by Indonesian President Susilo Bambang Yudhoyono.

Hospitals in the Indonesian capital were continuing to treat the wounded Friday as statements condemning the attacks flowed in from around the world.

Officials have said seven people were killed at the Marriott and two others at the Ritz-Carlton.

The U.S. State Department confirmed that eight U.S. citizens were among the wounded.