A swarm of thousands of mayflies took over a bridge in China - creating a slippery snow-like surface and paralysing traffic.

Ms. Lui, who was driving by the area, was left stunned when she saw the countless mayflies swirling in the air on Sunday (Sept 1).

The mayflies gathered in such large numbers that the ground was soon carpeted with their carcasses, creating a layer five centimeters deep.

The sudden onslaught of insects made the bridge's surface dangerously slippery, leading to a temporary paralysis of the traffic.

Despite the disruption, local agricultural experts assured the public that the mayflies are harmless and play a crucial role in the ecosystem.

The officials noted that their massive appearance is a positive sign that indicates improving local water quality.