A POWER LINE IS REPORTEDLY RESPONSIBLE FOR A FIRE IN SANTA CRUZ THURSDAY AFTERNOON. ACCORDING TO WITNESSES A DOWNED POWER LINE NEAR EAST CLIFF AND 4TH AVENUE CAUSED AN R-V PARKED TO CATCH FIRE AND EXPLODE. THE FIRE QUICKLY SPREAD TO A SINGLE STORY DWELLING, AND 4 CHILDREN WERE EVACUATED SAFELY. FIRE CREWS HAD THE BLAZE EXTINGUISHED BY ABOUT 5:30 P-M.