Firefighters extinguished a kitchen fire Saturday morning after a resident reportedly left hot oil unattended.  At about 5:47 a.m., firefighters responded to an apartment fire in the 9200 block of Cypress Avenue. According to a news release from the San Bernardino County Fire Department, a resident had apparently begun to heat up some oil in the stove top and left for a short period, during which time the oil heated up and ignited a fire. The sprinkler system activated and held the fire in check until firefighters arrived, the Fire Department said.