Terrorist attacks in Spain Thursday night and Friday morning left 14 dead and at least 100 injured. Four people were arrested in relation to the van that plowed into a crowded Barcelona district, though the driver still hasn't been identified, and Spanish police killed five people who attacked a resort in Cambrils.
In a statement on its Aamaq news agency, the Islamic State group claimed responsibility for the first attack in Barcelona. Spanish Prime Minister Mariano Rajoy said in a news conference that the fight against terrorism "is the principal priority for free and open societies like ours," Reuters reports. "It is a global threat and the response has to be global."
Immediately after the deadly attack, other world leaders began responding to the violence. See what they said ahead.