Footage shows a bus driver explaining how he helped victims out of the area.

Ambulances and police blocked off the area around London Bridge, South London, on Saturday evening, after a van reportedly ploughed into a crowd of pedestrians.

Footage shows a bus driver explaining how he helped victims out of the area, "Some tourists from Italy, they were scared, shaking and everything and I took them to the train station" he explained.

"They closed the station and they wouldn’t allow me to go back to my bus. My bus is now on the bridge and it is stuck there" he said.

The assault began when a van veered off the road and barreled into pedestrians on London Bridge, reports the Associated Press. Three men fled the van with large knives and attacked people at bars and restaurants in nearby Borough Market, police and witnesses said. The violence turned a summery night in an area packed with revelers into a scene of panic and chaos, with officers running through crowded streets screaming for people to flee. Lifeboats on the River Thames helped evacuate the area.