Heavy fog in China's northeast on Wednesday forced the closure of highways and the cancellation of airline flights, disrupting travel during a major holiday, a news report said. No accidents or injuries were reported.

The fog rolled into Shenyang, the biggest city in northeastern China, at about 4 am (2000 GMT Tuesday), cutting visibility to 50 meters (150 feet), the Xinhua News Agency said.

Four provincial highways were temporarily closed and at least 20 flights from Shenyang to South Korea, Japan and Chinese cities were delayed or canceled, Xinhua said.

The incident disrupted travel during the weeklong National Day holiday, when tens of millions of Chinese tourists travel.

The fog cleared by midday and normal road and air travel resumed, the report said.