WILMINGTON, Del. — Law enforcement officials have boosted security at the Delaware home of Vice President Joe Biden after several gunshots rang out from a vehicle speeding by the property over the weekend.

The vice president and his wife were not at their Wilmington home Saturday night when the shots were fired and there were no reports of injuries.

Biden’s office said the vice president and his wife, Jill Biden, were briefed Saturday night, as was President Barack Obama. Biden’s office referred all other questions to the Secret Service. The vice president was set to speak this morning in Wilmington at a Martin Luther King Jr. breakfast.

Secret Service spokesman Robert Hoback said the shots were fired at about 8:25 p.m. Saturday on a public road outside the home’s secure perimeter. Biden’s residence is several hundred yards from the road. Secret Service personnel stationed at the top of the long, winding driveway leading to Biden’s home heard the shots and saw the vehicle drive past at a high rate of speed and flee the scene.

The residence is in a wooded neighborhood of stately stone-and-brick homes along a curving two-lane road that winds through rolling hills. Biden’s home is not visible from the road, but a gatehouse cottage, occupied by the Secret Service, sits just yards from the main road, in front of a driveway blocked by security vehicles.

Authorities searched the area to determine whether any rounds hit anything.