UPDATE 8 PM EDT:

The incident at #Vauxhall is a stabbing and is not connect to the incidents at #LondonBridge & #BoroughMarket — Metropolitan Police (@metpoliceuk) June 3, 2017

UPDATE 6:45 PM EDT:

Info available at this stage: from 2208hrs officers responded to reports of a vehicle in collision with pedestrians on #London Bridge. 1/3 — Metropolitan Police (@metpoliceuk) June 3, 2017

Officers have then responded to reports of stabbings in #BoroughMarket. Armed officers responded and shots have been fired. 2/3 — Metropolitan Police (@metpoliceuk) June 3, 2017

Officers are now responding to an incident in the #Vauxhall area. 3/3 — Metropolitan Police (@metpoliceuk) June 3, 2017

ORIGINAL STORY:

An "incident" has occurred on the London Bridge.

We are dealing with an incident on #LondonBridge, when we have more information we will update this twitter feed. — Metropolitan Police (@metpoliceuk) June 3, 2017

The official tweet from Metropolitan Police:

Multiple news organizations and civilians are tweeting that a van has mowed down multiple people. There are also tweets reporting shots and a stabbing.:

Horrific scene at London Bridge... bodies strewn over the pavement. B&Q van mounted the pavement. I feel sick pic.twitter.com/quDYWHRum3 — Ben Leo (@benleo89) June 3, 2017

#LondonBridge is closed and helicopters are surrounding area, reported shots and van running over people in front of pub @BBCBreaking pic.twitter.com/SEkGqh222W — Kaine Pieri (@PieriKaine) June 3, 2017

London bridge station is being evacuated #londonbridge pic.twitter.com/ix3OD1V42D — Caroline Breniere (@carolinebrni) June 3, 2017

The reports also show that the London Bridge station is being evacuated.

This is a breaking story and will be updated as more information becomes available.

UPDATE: A second incident is ongoing.