Rio Ferdinand unwittingly sparked a security alert at the White House after posting photos on Twitter. The Manchester United and England defender published several photos of a visit to Barack Obama's presidential home, taken on the club's pre-season tour in Washington DC. However one snap of security men - accompanied by the comment "The security needs beefing up here at the White House....!!" - was mysteriously deleted from his page. Ferdinand, who boasts 1.3 million followers, commented: "Whoa....some1 has got into my phone + taken down my pics off twitter....this is deep...is jack Bauer in Washington?!" In a further reference to the spy-themed TV drama 24, which stars Kiefer Sutherland as agent Jack Bauer, Ferdinand then tweeted: "My pic of the security was #removed quick, rapido, sharpish, fast....they don't play here in DC...I feel like I'm on 24 right now #baffled" Ferdinand's other photos of the White House were not deleted. United take on Barcelona in a friendly at the 90,000-capacity FedEx Stadium on Saturday, a repeat of May's Champions League final.http://uk.eurosport.yahoo.com/blogs/world-of-sport/article/62923/