"A vehicle drove by the vice president's residence at a high rate of speed and fired multiple gun shots. This occurred on a public road outside the established security perimeter. The shots were heard by Secret Service personnel posted at the residence and a vehicle was observed by an agent leaving the scene at a high rate of speed," Secret Service spokesman Robert Hoback said.

The incident happened around 8:25 p.m. local time on Saturday. Guards were unable to detain the offender. The Secret Service and local police have started searching for the shooter. A person was detained during the operation for interaction with a police officer who was patrolling the perimeter.

However, there is no information on whether he is connected to the incident, as the test for gun powder on his hands was negative, The New York Times reported.

“The Secret Service is working closely with the New Castle County Police on investigating this incident,” the agency's statement reads.