Two Saturday night attacks in London

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A paramedic rushes to the scene after an incident in central London, Saturday, June 3, 2017.  (Dominic Lipinski/PA via AP)

British police say they are responding to two emergency incidents in London - one on London Bridge involving a van as well as a knife attack at nearby Borough Market.

British transport police say there are casualties.

The attacks happened on a busy Saturday night at about 10pm as in popular areas, crowded with people.

The first attack involved a van mowing down pedestrians on London Bridge.

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Armed Police officers stand guard on London Bridge in central London, Saturday, June 3, 2017. (Dominic Lipinski/PA via AP)

A witness told the BBC she saw a speeding white van veering into pedestrians. The witness said the van hit five to six people. Reuters television pictures showed dozens of emergency vehicles in the area around London Bridge.

London's transport authority said London Bridge rail station had been closed at the request of the police.

One witness told Reuters that she saw what appeared to be three people with knife wounds and possibly their throats cut.

On May 22, a suicide bomber killed 22 people at a pop concert by US singer Ariana Grande in Manchester in northern England.

The Manchester bombing was the deadliest attack in Britain since July 2005, when four British Muslim suicide bombers killed 52 people in coordinated attacks on London's transport network.

© RAW 2017