The Syrian Electronic Army claimed responsibility for the hack. This couldn’t be corroborated.
The FBI has opened an investigation into the incident, spokeswoman Jenny Shearer said. She declined to elaborate.
The SEA has taken credit for a string of Web attacks on media targets it sees as sympathetic to Syria’s rebels. Among the targets the group claims to have hacked are Twitter feeds of Al-Jazeera English and the BBC.
White House spokesman Jay Carney said the president was fine. “I was just with him,” Carney said at a news briefing.
Twitter had no comment.