Photo by RON JEFFERSWhen North Hudson firefighters arrived at this Boulevard East dwelling in North Bergen, December 14th, the top floor was fully involved in fire, threatening nearby exposures.A 2nd alarm was transmitted immediately, later followed by a 3rd alarm. An aggressive attack prevented the spread of fire to the other dwellings. Fire burned through the roof. Numerous hand lines and two ladder pipes were used to bring the fire under control in a 24 degree temperature.