WASHINGTON (AP) — Because of a string of security lapses, the U.S. Secret Service didn’t realize for four days that a man had fired a high-powered rifle at the White House in 2011.

Following an investigation The Washington Post concludes the Secret Service bungled the response to the shooting. An Idaho man was sentenced to 25 years in prison for firing at least seven bullets at the White House on November 11, 2011. The president and Michelle Obama were away, but one daughter was home.

The Post reported a White House usher expressed concerns about the safety for Malia Obama, who was to arrive within minutes of the incident.

In a statement to The Associated Press, the Secret Service said it beefed up White House security following a review of the incident.