BEIJING (Reuters) - The Chinese police on Monday closed the road that runs through Beijing's Tiananmen Square, the site of 1989 pro-democracy protests that were bloodily suppressed by the government, and evacuated the area following a fire, a Reuters witness said.

The Communist Party's official People's Daily said on its website that a car had caught fire. It provided no other details. Xinhua news agency, in a brief dispatch in English said that "a motor vehicle went into the crowd". Neither gave details.

Beijing police, reached by telephone, said they had no information. The Beijing government, also reached by telephone, said it did not know what had happened. The Reuters witness said he saw fire engines, an ambulance and numerous police cars heading in the direction of the fire, which sent a plume of black smoke into the sky.

The fire was on the north side of the square close to the main entrance of the Forbidden City, upon which hangs a portrait of the founder of Communist China, Mao Zedong. It was not clear if the fire was on the road, the pavement or the square.

A foreign tourist who was on the square and asked not to be identified said she heard an explosion, followed by a fire.

Tiananmen Square is always under heavy security due to its proximity to the Zhongnanhai compound of the central leadership and the Great Hall of the People, where the country's Parliament meets.