This is the dramatic moment a flash flood swamped a restaurant sending tourists running for their lives.

Dozens of people had been gathered in the cafe at the Khao Yai National Park in Nakhon Nayok, Thailand, yesterday (August 13).

But a sudden monsoon downpour caused a deluge and a stream burst its banks - sending tonnes of water gushing into a nearby seating area.

The resort in the popular wildlife area was packed with locals who had the day off for a national holiday celebrating the country's annual Mother's Day.

Hundreds of visitors were stranded after the downpour at different parts of the national park.

Onlooker Wanruadee Wongpheung said: ''The water had come down from the river at the Nang Rong waterfalls. It was scary and I was worried about all the people who were there.''

Hundreds of visitors were stranded in a resort inside the sprawling park with water levels too high for them to leave. They had to wait until evening when the water had subsided.

Park official Wichai Pornleesaengsuwan said the flash flood was caused by heavy rainfall coming down from the mountains.

He said: ''This is the worst flooding I have seen here for ten years. We are trying to ensure that everybody is safe and there are no injuries.''

This is the dramatic moment a flash flood swamped a restaurant sending tourists running for their lives.

Dozens of people had been gathered in the cafe at the Khao Yai National Park in Nakhon Nayok, Thailand, yesterday afternoon at 4pm.

But a sudden monsoon downpour caused a deluge and a stream burst its banks - sending tonnes of water gushing into a nearby seating area.

The resort in the popular wildlife area was packed with locals who had the day off for a national holiday celebrating the country's annual Mother's Day.

Hundreds of visitors were stranded after the downpour at different parts of the national park.

Onlooker Wanruadee Wongpheung said: ''The water had come down from the river at the Nang Rong waterfalls. It was scary and I was worried about all the people who were there.''

Hundreds of visitors were stranded in a resort inside the sprawling park with water levels too high for them to leave. They had to wait until evening when the water had subsided.

Park official Wichai Pornleesaengsuwan said the flash flood was caused by heavy rainfall coming down from the mountains.

He said: ''This is the worst flooding I have seen here for ten years. We are trying to ensure that everybody is safe and there are no injuries.''