SYDNEY, Australia (AP) _ Poisonous fumes escaped into part of Sydney's international airport Wednesday, and eight people were treated, officials said.

Ambulance and fire crews were called to the departure terminal shortly before 10 a.m. (7 p.m. EDT Tuesday) in response to a ``major gas leak,'' said Andrew Hall, a spokesman for the New South Wales state Ambulance Service.

Of the eight people who were treated, one was hospitalized, he said.

Airport spokesman Peter Gibbs said the leak would have no effect on the thousands of passengers arriving for the Olympic Games.

Sydney Airport is handling its heaviest workload ever as tourists, athletes and Olympic officials stream into Sydney for the games, which begin Friday.

Gibbs said the exact nature of the fumes was not known, and that there was no known source for natural gas to leak into the area.

``Several people have been affected by some sort of fumes at one part of the international terminal on the air side, that is, the other side of customs,'' Gibbs said.

Airport officials made a public announcement in the terminal asking passengers not to go to the immigration area. Passengers were told to stay in the departure lounge until further notice.

Gibbs said there was no indication that the fumes were caused by a fire.

The area affected was near gift shops and no passengers were reported affected, Gibbs said.