(Adds nine die in road crash, paragraph 7)

BEIJNG, Jan 14 (Reuters) - A "massive" landslide at a quarry in north China has killed one person and buried up to another 11, with explosives believed trapped in the rubble, state media said.

The landslide occurred on Sunday at a quarry in Jixian county of Tianjin Municipality and those trapped were believed to be buried deep under the rocks, Xinhua news agency said.

Rescuers pulled one body from the rubble and found some debris believed to be from a work shed at the site, the agency said.

"It is thought that there were at least seven people buried inside," Xinhua said, citing rescue officials.

Rescuers were working to locate those buried and cranes would be used to remove large rocks, Xinhua said.

"There might be more than 10 kg (22 lb) of explosives under the rubble, which made the rescue operation even more difficult and dangerous," Xinhua said.

On Monday, nine people were killed and 52 injured in a pile-up involving four vehicles on a highway in the central province of Hunan, Xinhua quoted police as saying.

A day earlier, seven people drowned in northeastern Liaoning province when a minibus driving across a frozen reservoir fell through the ice, Xinhua said.

The driver had "tried to take a shortcut by riding the minibus across the frozen Hongqi Reservoir. The ice cracked and the vehicle, with nine people on board, fell into water", Xinhua said, citing police.

The driver and a baby were rescued.

Rescuers recovered seven bodies and police arrested the driver, Xinhua said.

China's roads are the deadliest in the world, with accidents killing about 100,000 people a year. (Reporting by Beijing Newsroom and Ian Ransom; Editing by Nick Macfie and David Fogarty)

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