UPPER DARBY — A mob of about 40 people stormed into the Sears department store on 69th Street Thursday, and in a flash stole thousands of dollars worth of merchandise, officials said. Police were able to round up 15 juveniles and one adult, 19, all from West Philadelphia. “They came in on the El train and hit Sears,” police Superintendent Michael Chitwood said. “They stole sneakers, socks, watches, whatever they could get their hands on, and left. “Imagine the guts of this gang of young hoodlums. One was 11 years old. The others arrested ranged from 12 to 16 years...