The vice president and his wife were not at their Wilmington home last night when the shots were fired and there were no reports of injuries, authorities said today.
Biden's office said the vice president and his wife, Jill Biden, were briefed last night, as was President Barack Obama.
Biden's office referred all other questions to the Secret Service, which protects the president, vice president and their families. The vice president did not mention the incident at a Monday morning breakfast honoring civil rights leader Martin Luther King Jr.
Young Cho, who lives two houses up from the Bidens, told The Associated Press by telephone that he heard several gunshots last evening.
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"We heard the shots, four of them," Cho said. "But next door there is always Secret Service so I wasn't too worried. I feel really safe here. But it was really strange, to hear those kinds of shots next to the vice president's house."
Authorities searched outside the Biden residence and nearby homes to determine whether any rounds hit anything. Police said they also received a report of shots fired in the area of nearby Hoopes Reservoir, a source of fresh water for Wilmington.
Today afternoon, half a dozen sport utility vehicles were parked near the entrance of the Bidens' property, providing a heavy security presence.