Officers along border also monitor suspicious vehicles and airplanes

The summer fishing ban in boundary rivers and lakes in Heilongjiang province will run from June 6 to July 20, according to the provincial fishery bureau.

A ban is put into force in the province twice a year - in Xingkai Lake from June 6 to July 20, and in Heilong River and Wusuli River, on China's border with Russia, from June 11 to July 15 - during which all fishing activities are forbidden.