Condemning the recent terror attack outside the Houses of Parliament in London, President Pranab Mukherjee on 23 March, said terrorism must be met through collective action by the international community.
"India stands by UK; terrorism must be met through collective action by international community," President Mukherjee tweeted.
He also extended his condolences to the bereaved families.
"Shocked to hear about the terrorist attack in London," he said in another tweeted.
Earlier in the day, Prime Minister Narendra Modi also extended India's support to the United Kingdom in the fight against terrorism.
Meanwhile, political leaders across the world have come forward and condemned the incident in strong words.
British Prime Minister Theresa May described the attack as "sick and depraved."
U.S. President Donald Trump also offered his condolences during a call to Prime Minister Theresa May, the White House said
He also pledged "full cooperation and support of the United States Government in responding to the attack and bringing those responsible to justice."
Five people died after a single terrorist attacked Westminster, stabbing a police officer to death as he tried to storm the Parliament, and killing three members of the public as he careered through the heart of the capital in a 4x4 vehicle, according to the Guardian.