BEIJING, July 30 (Xinhua) -- Four people were injured when a civilian helicopter crash-landed on Monday morning on the outskirts of Beijing.

The crash-landing occurred around 11 a.m. in a parking lot in Chaoyang District of Beijing, injuring four people on board, according to Beijing police.

Nobody on the ground was injured. The four injured have been sent to the hospital for medical treatment.

Further investigation is under way.