North Hudson Regional Fire Rescue responded to a fire at 542 29th St. in Union City, NJ at approximately 11:00 A.M. The fire involved a 3 story wood frame mixed occupied building and quickly escalated to a 5 alarm fire. Heavy fire spread thru-out and into the cockloft. Numerous handlines and two ladderpipes operated. Mutual aid assistance was required from the Jersey City Fire Department. EMS on scene treated numerous firefighters for heat related injuries. The fire was placed under control at 1:44 P.M.