noun
looter at a fire scene; thief who steals during a fire
Specifically a person who steals from homes or buildings while a fire is in progress, exploiting the chaos.
火事場泥棒が燃えている家から金品を盗んだ。
A looter stole valuables from the burning house.
noun
opportunistic criminal during a disaster
Extended figurative use: a person who takes advantage of any chaotic situation (not only fire) to commit theft or other crimes.
震災の混乱に乗じて火事場泥棒のような行為をする者がいる。
There are people who act like looters, taking advantage of the confusion after an earthquake.