The massacre of Khitomer was perpetuated by the Romulien S against the Klingone Colony into 2346. Approximately 4000 Klingon S perished at the time of this massacre.

The Father of Worf had been marked wrongly to have given the codes in order to permetre to Romuliens carry out this attack. Mog (the Father of Worf) lost the life at the time of this attack.

Episode 16 of season 6 of Star Trek the new generation.