Hundreds of black birds circle above hospital in China

This hair-raising footage showing hundreds of black crows flying in circles above a hospital sparked worries among social media users that it might be a sign something ominous is about to happen.

The strange scene was captured by a woman who lives across the hospital in Changchun, in China's north-eastern Jilin Province. It lasted for around four or five minutes. According to the woman, hundreds of crows were circling in the sky, as if performing a silent performance.