WASHINGTON (AP) — Now that the summer travel season has come to an end, AAA Mid-Atlantic says gasoline prices should start to decline due to weaker demand.

In its weekly report on gas prices Sunday, AAA says the national average price for a gallon of unleaded was $3.52, down from $3.57 a week ago.

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The auto club warns that escalating violence in the Middle East, hurricanes or other disruptions could send prices back up.

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In the District of Columbia, the average price for gas was $3.68, down from $3.72 a week ago. The average price in both Maryland and Delaware was $3.49.

In Virginia, the average gas price was lower at $3.30 per gallon, down from $3.35 a week ago.

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