Washington: Multiple gunshots were fired from a moving vehicle outside the Delaware residence of US Vice President Joe Biden, the Secret Service said today as it launched an investigation into the incident.

Biden and his family were not at home when the firing happened last night at around 8.25 pm local time. According to Secret Service spokesman, Robert Hoback, at about 8.25 pm residents of the Biden's neighbourhood saw a vehicle drive past at a high speed, fleeing the scene.