Flooding amounts of water may be required before extinguishment can be accomplished. Do not use dry chemical extinguisher containing ammonium compounds. Do not let fire burn. Flood with copious amounts of water. DO NOT use ABC or other dry chemical extinguishers since there is the potential for a violent reaction.
Nitrogen trichloride can present an explosion hazard.
Immediately after a fire has been extinguished, check for wet or damp material. Any spilled material from burned or broken containers should be assumed contaminated. Neutralize to a non-oxidizing material for safe disposal. Do not attempt to re-close broken drums, even for movement to the disposal area. They should be left open to disperse any nitrogen trichloride that may form.