BEIJING (AP) — Seventeen people were killed in China after a two-story restaurant collapsed during a gathering Saturday morning, state media said.

The official Xinhua News Agency said 28 other people were injured in the accident, including seven in serious condition.

The restaurant was in Shanxi province’s Xiangfen county, about 630 kilometers (400 miles) southwest of Beijing.

The cause of the collapse was not immediately clear.

Hundreds of rescue workers, wearing hardhats and face masks, searched for trapped people in a daylong operation.

Video posted on social media by state broadcaster China Central Television showed them hefting heavy pieces of concrete. At least once, the remaining frame of the building shook but didn’t fall.

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This story has been corrected to show that seven of the injured were in serious condition.

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