Real Madrid's official Twitter account seems to have been been hacked, after a post welcoming Lionel Messi to the club appeared on their feed.
Just days after Barcelona's account was taken over by hackers OurMine, which announced Paris St Germain's Angel Di Maria had joined the club as a hoax, the group was at it again, this time on the Champions League winners' account.
At 5.30am BST, accompanied by a video of Messi scoring for Barcelona against Real Madrid, a post on Real's Twitter said: "Benvingut Messi! Â¡Bienvenido Messi! Welcome Messi! Bienvenue Messi! #Messi."
The group, which has hacked a series of high-profile accounts over the past 12 months, then followed it up with a series of tweets claiming responsibility for the hacking, saying: "Internet security is s*** and we proved that."
The post went viral, with over 27,000 retweets in the first 45 minutes of it being up.
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Lionel Messi has been named in Argentina's squad for their upcoming World Cup qualifiers after reversing his decision to retire from international football.
The Barcelona star announced on Friday he loves Argentina "too much" to walk away from the national team, having announced his Albiceleste career was over following their penalty shoot-out loss to Chile in the Copa America final in June.
Following talks with new Argentina coach Edgardo Bauza, Messi was included in the squad to face Uruguay and Venezuela next month.
Messi, Argentina's captain and all-time record goalscorer with 55 goals, said: "I see there are many problems in Argentinian football and I don't intend to create another one.
"I don't want to cause any damage, I've always tried to do just the opposite, to help all that I can.
"We need to fix many things in Argentinian football, but I prefer to do this from inside and not criticise from outside."
Barcelona have launched a campaign urging fans to "express their sympathy" in support of forward Lionel Messi after he appealed against a 21-month prison sentence for tax fraud imposed by a Catalan court.
Messi and his father, Jorge, were sentenced on Wednesday after a Barcelona court found them both guilty of three counts of defrauding the tax department to the tune of €4.1million.
Under Spanish law, sentences under two years are usually suspended but, nonetheless, Barca have called on supporters to voice their "unconditional support on social networks".
A statement on www.fcbarcelona.com read: "FC Barcelona has set up a campaign in support of Leo Messi following the sentence issued this week against the Argentinian and his father.
"Using the hashtag #WeAreAllLeoMessi while posting a photo or message with both hands open, the campaign is encouraging all Barca fans to express their sympathy for the greatest footballer in the world by voicing their unconditional support on social networks.
"By making it clear that #WeAreAllMessi, we want Leo to know that he is not alone. All members, supporters clubs, fans, athletes, media and everyone else are invited to participate."
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Argentina's Lionel Messi has said he is retiring from international football after losing the Copa America Final.
Chile beat Argentina 4-2 on penalties after the match ended 0-0.
"It's tough, it's not the time for analysis," the 29-year-old Barcelona forward was quoted as saying on the Argentine national team's Twitter account.
"In the dressing room I thought that the national team was over, it's not for me."