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Cambrils police say those behind a van attack which left six people injured in the resort town were carrying explosive vests, according to the Associated Press.
The confirmation follows Spanish police saying the deadly Barcelona van rampage that killed at least 13 people, the Cambrils police shootout and a house explosion are linked.
The four attackers shot dead by police in Cambrils, 120 kilometres south of Barcelona, were wearing explosive belts. A fifth attacker died after earlier being injured in the operation.
Authorities believe they stopped a terrorist attack in Cambrils just hours after a van rampaged through Barcelona's city centre killing 13 people and injuring more than 100 others on Thursday.
Six civilians and one police officer were injured in the Cambrils incident, which police say is ongoing but under control with controlled explosions also underway.
We work with the hypothesis that the incident of #Cambrils respond to a terrorist attack. We have shot down the perpetrators
In the hours before the Barcelona rampage, a house exploded in the town of Alcanar, further south of Cambrils, where a source has told Catalan police explosives were being made in glass cylinders.