Barcelona's players and coaching staff held a minute's silence before training on Friday in tribute to the victims of the terror attack in the city.
At least 13 people died and dozens were injured on Thursday when a van ploughed into pedestrians in Barcelona's busy tourist area of Las Ramblas.
Barca had already confirmed that players of all their teams would wear black armbands during games this weekend - the senior side begin their Primera Liga campaign against Real Betis at Camp Nou on Sunday - while a minute's silence will be held at matches across Spain.
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The Catalan club also showed their support for those affected by the attack on Friday morning, with players and staff standing in a semi-circle at the club's training ground while holding a minute's silence.
Barca tweeted a short video of the tribute along with the TotsSomBarcelona (we are all Barcelona) hashtag.
Earlier in the day, Twitter and Instagram accounts of the Catalan club as well as those of many players - current and former - were abuzz with posts expressing shock over the terror attacks that killed 13 people and injured many more.
Several players pledged their support to the city and its people, while also offering their condolences to those who lost their lives late on Thursday night.
#TotsSomBarcelona Our thoughts are with the victims of the Barcelona attack👇 https://t.co/wi7yiUH5qK
— FC Barcelona (@FCBarcelona) August 17, 2017
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Conmocionado por lo ocurrido en las #Ramblas. Toda mi fuerza para víctimas y familias
— Ivan Rakitic (@ivanrakitic) August 17, 2017
Shocked by the tragedy at the #Ramblas of #Barcelona 🙏
Barcelona-based Espanyol published photographs of their squad linking arms in a circle to pay their respects ahead of Saturday's trip to Sevilla.
You saw us born. And make us centenaries. Always together, always yours. With all the pride of the world. We love you, Barcelona! pic.twitter.com/yYPFPRBQ8G
— RCD Espanyol de Barcelona (@RCDEspanyol) August 18, 2017
Todos consternados por lo que ha pasado y las noticias que siguen saliendo desde nuestra ciudad. Todo mi cariño. pic.twitter.com/CIhEKncx4A
— Andrés Iniesta (@andresiniesta8) August 17, 2017
Also read: Spain hunts driver who killed 13 after foiling second attack
Very shocked for what happened in Barcelona. All my support to the city and families! pic.twitter.com/YDtyAiw7Qc
— Luis Suarez (@LuisSuarez9) August 17, 2017
Barcelona terror attack: What we know
Spanish and European champions Real Madrid also tweeted a picture of their first-team squad holding a minute's silence at Valdebebas, with the likes of newly promoted Catalan club Girona, Granada, Levante and Real Mallorca posting similar images of their players and staff on their accounts.
Many clubs across Spain had already tweeted their support for Barcelona on Thursday evening.
Consternado com as notícias que chegam de Barcelona. Todo o apoio e solidariedade a família e amigos das vítimas.
— Cristiano Ronaldo (@Cristiano) August 17, 2017
My prayers go out to victims and their families. Time to be one 🖤 #Barcelona
— Arda Turan (@ArdaTuran) August 17, 2017