A local security checkpoint, in Ejina Banner, north China's Inner Mongolia Autonomous Region, is completely destroyed during an attack by over 100 masked people on Dec. 6, 2015. [Photo: qq.com]

It has been reported that a number of arrests have now been made in connection with an attack on a police outpost in Inner Mongolia.

Around 100 people, armed with sticks and stones, attacked a remote checkpoint on Sunday afternoon along the provincial border between Inner Mongolia and Gansu.

The mob trashed the police station, injured over a dozen people inside the facility, and then reportedly dumped some of them in the nearby desert.

Despite the scale of the attack, authorities are not describing it as terrorism.

Instead, the attack is said to involve a long-running border dispute between people in the area living on the Inner Mongolian and Gansu sides.

A local official has revealed the area has long been the source of contention among locals because of the repeated redrawing of provincial boundaries in the 1960s and 1970s.

At issue is which side of the provincial border people's lands fall on, as they are subject to different restrictions, depending on which side they're on.

In September, the same police outpost was ransacked by masked men carrying sticks, who intimidated staff.