Two Newark firefighters died and 6 were injured as they battled a blaze on a massive cargo ship carrying vehicles in the port of Newark, New Jersey, officials said, writes CNN.

Firefighters responded to a call of multiple vehicles on fire on a roll-on/roll-off cargo ship named Grande Costa D’Avorio.

Firefighters boarded the ship and went to the 10th or 11th floor to extinguish the flames. Two members then made mayday calls reporting they were lost within the fire, Newark Fire Chief Rufus Jackson said: “Members made an attempt to extinguish the fire but got pushed back by the intense heat. Two firefighters were lost while conducting this action of backing out of the structure”.

The firefighters were identified by authorities as Augusto Acabou, 45, and Wayne Brooks Jr., 49. In addition, 3 Newark firefighters and 2 firefighters from other departments suffered burns, heat exhaustion and smoke inhalation. A 6th firefighter was also injured. That person’s injuries were not specified.