RICHMOND, Va. (AP) -- -

Gasoline prices in Virginia have increased an average of seven cents per gallon over the past week.

AAA Mid-Atlantic says the average price of a gallon of unleaded gas was $3.21 on Friday, up from $3.14 the previous week. That's also three cents more than the same date a year ago.

Prices averaged $3.27 in Norfolk, $3.22 in Richmond, $3.14 in Charlottesville and $3.12 in Roanoke.

The national average was $3.28, up six cents from last week and two cents from a year ago.
AAA says rising demand and lower supplies have driven up the price of crude oil, resulting in higher prices at the pump.