Social media and the stock market went wild, briefly, on Tuesday when this (hacked) Associated Press tweet appeared around 1 p.m.: "Breaking: Two Explosions in the White House and Barack Obama is injured."
The AP took down its Twitter account and quickly announced it had been hacked.
Rest assured, there's been no attack on the White House -- and aides say President Obama is busy at work.
"The president is fine," said spokesman Jay Carney. "I was just with him."
The Dow Jones industrial average plunged more than 128 points in seconds after the report. And it recovered just as quickly when the report was found to be false.
The incident took place just eight days after the Boston Marathon bombings.
In a statement, the Associated Press said: "The AP twitter account has been hacked. A tweet about an attack at the White House is false. We will advise on acct. status."
The AP also confirmed that its Twitter account has been suspended, and "it was working to correct the issue."