World leaders have united in condemnation of a suspected terrorist attack in London today, which left at least four people dead and 40 others injured.

A man thought to be the attacker died after being shot by the police.

US President Donald Trump spoke with British Prime Minister Theresa May following the attack.

“He pledged the full cooperation and support of the United States Government in responding to the attack and bringing those responsible to justice,” said a White House.

Canada’s Prime Minister Justin Trudeau tweeted that Canadians “remain united with the people of the UK.

French President Francois Hollande expressed his “solidarity” with the British people, while Belgian Prime Minister Charles Michel—whose country marked the anniversary of the deadly 2016 attacks in Brussels on Wednesday—said that his country “stands with [the] U.K. in [the] fight against terror.”

German Chancellor Angela Merkel was “deeply shocked” by the attacks, according to a statement from the German Embassy in London.

Rex Tillerson, the US Secretary of State, said in a statement that “the American people send their thoughts and prayers” to the UK “We condemn these horrific acts of violence, and whether they were carried out by troubled individuals or by terrorists, the victims know no difference,” said Tillerson.

“Terrorism concerns us all and France knows what the British people are suffering today,” President Hollande said in a statement. France has witnessed several deadly attacks in recent years, including attacks in Paris in November 2015 that killed 130 people.

Donald Tusk, the president of the European Council, said that his thoughts were with the victims. “Europe stands firm with the UK against terror and ready to help,” said Tusk.

Danish Prime Minister Lars Rasmuss said that he was “horrified by the images from London” and offered his support to our “British friends.”