The other suspects have been killed by police or detained following last week's attacks in Barcelona and the seaside resort of Cambrils.
Spanish police warned today that the suspected driver of a van that mowed down pedestrians in Barcelona was dangerous and likely armed, as a manhunt for the Moroccan national widened across Europe.
Police in Catalonia launched an appeal for information about the fugitive, Younes Abouyaaqoub, 22, believed to be the last remaining member of a 12-man cell.
The other suspects have been killed by police or detained following last week's attacks in Barcelona and the seaside resort of Cambrils. The Islamic State (IS) claimed responsibility for the assaults, believed to be its first in Spain.
Authorities today raised the death toll of the attacks to 15, confirming that Pau Perez, a 34-year-old man found stabbed dead in a Ford Focus outside Barcelona on Friday, was killed by Abouyaaqoub.
The police had fired at the car as it forced the checkpoint shortly after the Barcelona carnage, and later found Perez stabbed dead in the vehicle.
Investigators believe the victim was the owner of the car, which was hijacked by Abouyaaqoub to make his getaway after the Barcelona assault.
Describing Abouyaaqoub as around five feet, 11 inches tall, police tweeted four photographs of the man with short black hair, including three pictures in which he was wearing a black and white striped T-shirt.
He is "dangerous and could be armed," police in Catalonia said today, as officials also announce that they have identified all 15 victims in the assaults.
Spanish authorities were also officially notifying European police today of the identity of the suspect to enable the launch of a Europe-wide manhunt.
"We have to talk to European police to notify them of the identity because this person... is likely being sought in all European countries," said Catalonia regional interior minister Joaquim Forn.
Investigators seeking to unravel the terror cell have homed in on the small border town of Ripoll, at the foot of the Pyrenees mountains.
Several of the suspects including Abouyaaqoub grew up or lived in the town.
A Moroccan imam, Abdelbaki Es Satty, aged in his 40s, has also come under scrutiny as he is believed to have radicalised youths in Ripoll.
Police raided more homes in Ripoll today, Forn said.
Police said the imam had spent time in prison and had once been in contact with a suspect wanted on terrorism charges but was never charged with terror related incidents himself.
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(This article has not been edited by DNA's editorial team and is auto-generated from an agency feed.)
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