Hours after the Barcelona attacks, police shot dead five people in the seaside resort of Cambrils after they mowed down pedestrians in a vehicle but have not released any names of the alleged terrorists.
Spanish media is reporting that one suspect has been arrested in the barcelona attack that killed ad many as 13 people and injured scores more.
However, police now suspect that Driss's younger brother, Moussa Oukabir, could have been involved in the accident.
Spanish policemen walk in a cordoned off area after a van ploughed into the crowd, killing 13 persons and injuring over 80 on Las Ramblas in Barcelona on August 17, 2017.
Officials say Oukabir was born in Ripoll and holds Morroccan citizenship, and the other suspects were born in Morocco and have Spanish residency.
Spanish police had said that they were searching for three suspects with most of the other suspects being Moroccan and one remaining unaccounted for.
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Oukabir's older brother Driss, was arrested in Ripoll, about 100 kilometres north of Barcelona, police said on Friday.
It's unclear if the other three were among the five shot in Cambrils or are still on the run, but Italy's La Stampa reports that border guards are on the lookout for Abouyaaqoub, who may be trying to flee in a Renault Kangoo van.
A couple of months earlier, he had reportedly shared a video claiming that "the lie of Jewish liberation" was being used to promote Zionism and Jewish supremacy. According to La Vanguardia, Moussa is 18 years old and lives in Barcelona.
On Thursday evening, the Catalan regional president, Carles Puigdemont, confirmed that two people had been arrested in connection with the attack, which left 12 people dead and injured at least 80.
The Islamic State in Iraq and Syria (ISIS) group said it had carried out the attacks, though it is not clear whether the attackers were directly connected to the group or simply inspired by it.