At least 13 people are dead, and more than 50 others are injured after a van crashed into a crowd of people at a popular tourist area in Barcelona, Spain.
It happened early Thursday evening local time on Las Ramblas — a mostly pedestrian street that runs through the heart of the city.
Police arrested one man and say they're treating the situation as a terror attack.
In a seemingly separate incident, police shot and killed a man who drove into two officers at a traffic blockade in Barcelona. Officials haven't said if the two incidents are related.
Leaders from across the globe sent messages of support Thursday. President Donald Trump tweeted: "The United States condemns the terror attack in Barcelona, Spain, and will do whatever is necessary to help. Be tough & strong, we love you!"
U.K. Prime Minister Theresa May and French President Emmanuel Macron also expressed solidarity with Spain after the attack. Both countries have recently witnessed similar car attacks.
May said: "My thoughts are with the victims of today's terrible attack in Barcelona and the emergency services responding to this ongoing incident. The UK stands with Spain against terror."
A translation of Macron's tweet says, "All my thoughts and solidarity of France for the victims of the tragic attack in Barcelona. We remain united and determined."
In March, four people died, and dozens more were injured in an attack near London's Parliament building. An attacker drove through a crowd of people before stabbing and killing a police officer.
And in mid-2016, more than 80 people died when a semitruck drove through a crowd celebrating Bastille Day in Nice, France.