Chinese helicopters violated Indian airspace twice in Himachal Pradesh last month.
As per reports, the intrusions were taken up with the central authorities appropriately by the state government.
The first intrusion was reported on April 11 and the second on April 20, said an Indian Airforce official.
In both incidents, a Chinese helicopter was observed flying on the Indian side of the international border close to Sumdoh in Spiti subdivision, the official added.
Sumdoh is located on the border of Kinnaur and Lahaul-Spiti districts and is manned by the state police.
Beyond Sumdoh, the Indo-Tibetan Border Police (ITBP) personnel are deployed.
Himachal Pradesh shares a porous border with China and smuggling of rare species of fauna and Chinese goods like blankets and thermos flasks across the border is quite frequent.