Firefighters battled a 10-alarm fire Saturday in Cambridge that started in the afternoon and raged on into the night. The fire was reported just before 3 p.m. on Berkshire Street and reached nine alarms about 30 minutes later, and eventually hit 10 alarms. The flames were lessened but still burning as of 11 p.m. Officials say the blaze Saturday is the largest Cambridge has seen since the 1980s. Flames extended to as many as 11 buildings in the area and several cars, according to Cambridge Fire Chief Gerald Reardon, as more than 130 firefighters from 17 or 18 companies worked to put out the blaze. It’s unclear what the extent of the damage is.