#FCKISIS and No Pasaran! Twitter Defiant Against Daesh Over Barcelona Attack

During a live on-the-scene update on the Barcelona bombing by a local news program, a man walked behind the presenter, proudly wearing a t-shirt emblazoned with the slogan "FCK ISIS." Response on social media was immediate and overwhelming.

At least 14 people were killed and over 100 injured in the August 17 terrorist attack in Barcelona. Daesh have been quick to claim responsibility for the atrocity – and one man has responded defiantly, becoming a social media "hero" in the process.

Un aplauso para el de la camiseta!!!!

Vía @octavian_cc pic.twitter.com/Bw4YrXk5E9

— Qué desfase!! (@QueDesfase) August 18, 2017​

#Barcelona and #TheWorld says #FCKISIS https://t.co/S2vU3mayln

— vw vixen (@vw_vixen) August 18, 2017​

The hashtag #FCKISIS grew popular on Twitter with users posting encouraging and defiant messages.

#FuerzaBarcelona #FCKISIS

— HoolBierzo (@hoolbierzo) August 18, 2017​

#FCKISIS 😘 pic.twitter.com/JmMnFUMaRn

— EldelCau (@EldelCau) August 18, 2017​

Victimas atentado de Barcelona D.E.P #EspañaNoSeRinde #TodosSomosBarcelona #FCKISIS pic.twitter.com/t7Ay3daDnB

— Grada_madridista (@MadridistaGrada) August 18, 2017​

Una abraçada solidària al poble català.
Contra el terror yihadista… NO PASSARAN!!#FCKISIS pic.twitter.com/F6VmTtCWtE

— JosuMari (@JosuMari68) August 18, 2017​

Thinking of those in Barcelona today..beautiful city thats been tormented by wasters😢😢 #fckisis pic.twitter.com/eNUReHMZC3

— Stephen (@Stevo_gfc) August 17, 2017​

Mere hours after the savage strike, which saw a van mow down holidaymakers and locals in Barcelona, Daesh's Amaq News Agency issued a statement, stating the perpetrators of the attack were "Islamic state soldiers," and the attack was carried out in response to Spanish military actions against the group.

A Daesh-supporting Twitter account then celebrated the atrocity, telling "all Spanish people" the time had come to "pay for everything your government has done to innocent people in our countries."

As of August 18, three people have been arrested on suspicion of involvement in the attack — including Driss Oukabir, a 28-year-old Moroccan believed to have rented the van — while a major national manhunt for the driver is ongoing.

Injured people are treated in Barcelona, Spain, Thursday, Aug. 17, 2017 after a white van jumped the sidewalk in the historic Las Ramblas district, crashing into a summer crowd of residents and tourists and injuring several people, police said

© AP Photo / Oriol Duran

The Catalonian capital is just the latest European city to fall victim to a major terrorist outrage. Citizens of 24 countries were among those killed, including one Belgian national confirmed to have died.