When the genocide in Rwanda began on April 6, 1994, Steć was one of the first UN officers (with Polish Major Marek Pazik, Canadian Major Brent Beardsley and a three-man Bangladesh crew) who, called upon by two other Polish UNAMIR officers, Majors Jerzy Mączka and Ryszard Chudy, arrived by Czech armoured personnel carrier to the location of a massacre in Gikondo, the first discovered by UNAMIR. Steć filmed the bodies with his camcorder in order to secure the proof of a possible genocide and was the first UNAMIR officer to use this word. As noted later "we were explicitly forbidden to use the word genocide in our correspondence to New York".