Chilling new footage shows the Cambrils terrorists laughing and joking as they prepared for their horrific attacks.
They were part of the same cell as the Barcelona terrorist, who killed 14 people.
Three of the attackers were seen on CCTV stocking up on items at a service station shop, only hours before their rampage.
They have been identified as Omar Hychami, Las Ramblas killer Younes Abouyaaqoub's brother Houssaine and Moussa Oukabir.
The group were seen at the station several times before they committed their atrocities. It is believed they used the venue to organise their plans.
One video from ARA shows the men smirking and giggling as they discuss the type of lighter they want to buy.
Another time they bought top-ups for their phones.
Hours after the deadly Barcelona attack, they drove a vehicle into pedestrians and attacked them with knives and an axe in the resort of Cambrils, leaving one dead and six injured.