Violent punks caught on video ganging up on, brutally beating elderly man by Baltimore 7-Eleven — while wielding rifle, sword

Baltimore Police posted video Wednesday showing six "younger males" ganging up on and brutally beating a 74-year-old man outside a 7-Eleven; the attackers also were wielding a rifle and a sword, police said. Police said the "attempted armed robbery" occurred in the 2500 block of Liberty Heights Avenue around 3:46 a.m. July 7.…