Three assailants drove a van at high speed across London Bridge, by one of the city’s busiest stations, at around 10 pm local time on Saturday night.

Police ushered civilians and the media down Southwark Street in central London in the early hours of Sunday after a van ploughed into pedestrians on London Bridge late on Saturday evening.

Three assailants drove a van at high speed across London Bridge, by one of the city’s busiest stations, at around 10 pm local time on Saturday night, before ferociously attacking people, including an off duty police officer, with knives around Borough Market, a popular and lively area with pubs, restaurants and shops.

In the aftermath of the attack London’s police force used a new warning system urging people to “Run, Hide, Tell,” outlining the ways in which people should respond if caught up in an attack.

The attack comes days before the general election is due to take place, and after Britain’s threat level was reduced back to “severe” after being raised to its highest level — “critical” — following the Manchester attack. The main political parties said they would be suspending election campaigning till the end of the day.