PHILADELPHIA, June 13. -- A boy was fatally burned, a score of persons were injured, eleven two-story brick dwellings were destroyed, and thousands of feet of moving picture films went up in flames this morning as a result of an explosion in the Lubin moving picture plant at Twentieth Street and Indiana Avenue. The loss resulting from the destruction of the moving picture reels is estimated at $1,500,000. A New York angle on the explosion that destroyed the Lubin Film Company. By Lara Fine