(AGI) Vienna, Sept 23 - Austria issued a warning over Russiangas supplies on Tuesday, reporting a reduction of between 20and 25 percent in deliveries on Friday and Saturday. "A drop of20 to 25 percent is not 'normal'," said Martin Graf, ExecutiveDirector, Energie-Control Austria. Gas companies have contactedGazprom to ask why, but have received no reply, Mr Graf added.At the moment Austrian gas storage is at 99 percent capacity.(AGI) . .