There have been reports of death of at least one person as another terrorist attacks the UK capital, England, according to the Metropolitan police.
According to the reports, police and emergency services were alerted to reports of a van hitting people on London Bridge after 10 pm (11 pm Nigerian time).
Armed officers went to nearby Borough Market where they were responding to reports of stabbings in the area which is known for its restaurants and bars.
London Ambulance Service said at least 20 people have been taken to hospital.
A number of people were treated at the scene for less serious injuries.
"At 0025hrs [1. 25 am Nigerian time],4/6/17 the incidents at #LondonBridge & #BoroughMarket were declared as terrorist incidents,"The Metropolitan Police tweeted.
In her words, the British Prime minister, Theresa May described that attacks as "dreadful events"and will chair a meeting of the government's Cobra emergency committee later.
Home Secretary Amber Rudd said the attacks were "horrific" and "targeted at people enjoying their evening with friends and family".
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London Mayor Sadiq Khan said: "We don't yet know the full details, but this was a deliberate and cowardly attack on innocent Londoners and visitors to our city enjoying their Saturday night. I condemn it in the strongest possible terms."
According to eyewitnesses, between two and four persons were seen getting out of the van after the bridge attack and running towards Borough Market.
Gunshots were later heard in the area while one social media user has posted a photograph appearing to show one of the attackers lying on the ground outside a pub in the food market, with what seemed to be canisters strapped to his body.