Prime Minister Narendra Modi on Friday called up his British counterpart Theresa May to convey India's support in wake of the London terror attack.

"PM called UK PM H.E. Theresa_may to express India's solidarity and conveyed deepest condolences for victims of the terror attack in London," the Prime Minister's Office said in a tweet.

On Wednesday, an attacker in a vehicle mowed down a number of pedestrians on the iconic Westminster Bridge in London, killing three people, and later knifed to death a policeman on the grounds of the Houses of Parliament before he was shot dead.