RIVERSIDE, Calif. -

The average price of a gallon of self-serve regular  gasoline in the Inland Empire rose 1.9 cents Tuesday to $3.87, the 10th increase  in the past 12 days.

   The average price in Riverside and San Bernardino counties has risen 7.8  cents over the past 12 days, including 1.9 cents on Monday, according to  figures from the AAA and Oil Price Information Service.

   The average price is 6.3 cents more than one week ago, but 4.6 cents  less than one month ago and 25.2 cents below what it was one year ago, mainly  thanks to a stretch of 29 decreases in 30 days that ended Aug. 30.

   The rising pump prices are caused  by increasing oil prices stemming  from continued Middle East tension, according to Jeffrey Spring of the  Automobile Club of Southern California.