Photo: The Canadian Press

A cell of at least nine extremists meticulously plotted to combine vehicles and explosives in a direct hit on tourists, and managed to carry off most of their deadly plan, killing 14 people, authorities said Friday. Police in Spain and France pressed a manhunt for any remaining members of the group, which Islamic State claimed as its own.

Only flawed bomb construction avoided a more devastating attack, authorities said after taking a closer look at a blast Wednesday evening in the town of Alcanar that was first written off as a household gas explosion. At least one person was killed and several injured in the home where police said the deadly plan took shape.

Eighteen hours later, a rented van veered into Barcelona's crowded Las Ramblas promenade, swerving along the walkway Thursday and killing 13 people. A surveillance video from inside a museum, which captured images of the van, showed it speeding down the promenade, barely missing a person with a stroller while others scattered.

Armed with an axe, knives and false explosives belts, attackers then drove a second vehicle to the boardwalk in the resort town of Cambrils early Friday, fatally injuring one person. Five of those attackers were shot to death, among them 17-year-old Moussa Oukabir, according to a Spanish police union official, confirming Spanish news reports.

Oukabir's name was first on a document listing four suspects sought in the attacks, said the official, who spoke on condition of anonymity to discuss the investigation. The Barcelona-based La Vanguardia newspaper, Spanish national broadcaster RTVE and other outlets cited police sources as saying he was the driver of the van in Barcelona.

The arrest order was issued throughout Spain and into France, according to the Spanish official and a French police official, who also spoke on condition of anonymity to discuss the document. They did not say what became of the other three men listed, who ranged in age from 18 to 24. All had roots in Morocco; only Moussa Oukabir was born in Spain, according to the document.

Earlier in the day, Catalan regional president Carles Puigdemont said at least one "terrorist is still on out there. We do not have information regarding the capacity to do more harm."

The French official said Spain had flagged a rented van that was believed to have crossed the border to the north.