Your losses occurred during an in game event, sponsored by the largest player run organization in the game.
It was reported on March 2nd, 2018 here: https://imperium.news/burn-jita-5-begins-kills/
and here on these forums as well here: Burn Jita!
Lots and lots of characters participated in support of, and against, Burn Jita.
There has been in the past a Burn Amarr event as well.