This is stated in a spot report by the OSCE SMM, which was published on the organization's website.
"At 10:22 on May 30, an SMM patrol consisting of six members and two armored vehicles arrived at the SMM camera site just outside the disengagement area near Petrivske (41km south of Donetsk). At 10:58 the patrol members were stationary in two vehicles with the doors open when they all heard a whistling sound followed by an explosion, and saw dark grey smoke coming from behind an abandoned brick farm building, 200-300m south-south-west, assessed as outside the disengagement area," the report says.
It notes that the explosion was caused by an impacting mortar round (82mm). The patrol left the area immediately and returned safely to its base in Donetsk city.
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