Footage posted on social media appears to show fireworks being shot at two Just Stop Oil activists who scaled a bridge.
The video seems to capture the explosives being aimed at the climate change protesters as they sit atop the 275ft masts on Dartford Crossing, also known as the Queen Elizabeth II bridge.
Red and orange sparks can be seen lighting up the sky near the top of the bridge, with people heard laughing as the fireworks boom.
