Secret Service investigating how intruder entered home of top Biden aide Jake Sullivan

Washington — The U.S. Secret Service is investigating how an intruder managed to enter the home of national security adviser Jake Sullivan last month without being detected by his security detail, the agency said Tuesday. 

The incident occured in late April, when an unknown man walked into Sullivan's home in Washington around 3 a.m., a U.S. law enforcement official said. Sullivan confronted him and told him to leave. The Secret Service detail outside, which consisted of more than two people, was not aware of the intrusion until Sullivan told them. There were no signs of forced entry and the intruder is still at large.

The Washington Post first reported the intrusion, and said the man "appeared to be intoxicated and confused about where he was."