A gang wielding knives and axes attacked civilians, a police station, government offices and smashed vehicles in a restive region of China, the country’s state-run Xinhua news agency reported Tuesday, citing local police.

The incident — called an “organized and premeditated” terror attack — occurred Monday in northwestern China’s Xinjiang Uyghur Autonomous Region.

Police officers at the scene shot dead dozens of people in the mob. Thirty-one cars were vandalized, including six that were set ablaze.

It was not immediately known how many people were killed and injured.

The location, Shache County, is where nine people authorities describe as terrorists attacked a police station, hurled explosives and torched police cars in December. Police shot and killed eight people in that attack.

There have been other attacks in the region in recent months.