A crowd chanted "I am not afraid!"
"On Sunday, before the 2017-18 La Liga opener against Betis, the Camp Nou will hold a minute's silence in recognition and memory of the victims".
"It is with great sadness that I must report that one of our team members was killed in the attack in Barcelona yesterday", Purch CEO Greg Mason announced in an email to the company.
Spain has also had to deal with a decades-long campaign of violence waged by Basque separatist group ETA, which only declared a ceasefire in 2011.
On Thursday, a van plowed into pedestrians visiting Barcelona's iconic Las Ramblas, the city's busiest tourist promenade. One person was killed.
Investigators meanwhile were working furiously to unravel the terror cell of at least 12 young men - some of them teenagers - behind the Barcelona rampage and a second ramming attack with a car in the seaside town of Cambrils.
Of the four people already arrested, police said three were from Morocco and one was from Spain, police said. All the suspects on the list hail from Ripoll, a quiet, upscale town of 10,000 about 100 kilometers north of Barcelona.
"It's the principle of 'soft targets'", Frederic Gallois, the former head of France's elite GIGN police force, told AFP. She was often at the club, and was committed to our club.
A petition has been launched in Catalonia to take action against twitter accounts mocking the victims of yesterday's terror attack in Barcelona.
As one commentator has written, the banality and nontheatrical nature of ISIS's approach to terrorism - particularly in contrast to al-Qaida's keen eye for spectacular symbology - has left many onlookers less than impressed and far from terrified. The perpetrator, Man Haron Monis, proclaimed he was acting under ISIS auspices. No one was home.
People weren't sure whether gunshots heard were coming inside the building, and were terrified that there might be a shooter in the hotel, Gray said.
He is understood to be receiving psychological support in the aftermath of the incident.
Moussa Oukabir is suspected of using his brother's documents to rent the van that mowed down people on the famous boulevard.
'And we have brought together a comprehensive strategy'. "He recently started praying. but it stopped there". It was reported that the attackers abandoned the van and fled the scene.
Spain is now holding three national days of mourning.