A van has ploughed into crowds in Cambrils, "24 Horas" reports.
Spanish police say 5 people have been injured in a "massive crash".
A Catalan police spokeswoman said police had killed four attackers in Cambrils, south of Barcelona, and another was seriously injured following an operation there against what authorities called a terrorist attack, Reuters reported.
The operation came after a van attack in Barcelona on Thursday that has so far left 13 dead.
The incident comes just hours after Thursday's van ramming attack in Barcelona's city square that left 13 dead. Police have not said if the incident in Cambrills is or isn't related to the Barcelona attack, which Daesh has claimed responsibility for.