Gaza sources initially reported that the three were hurt by a shell fired by an Israeli tank force. The IDF denied striking in Gaza and said the blast was caused by the firing of a Palestinian mortar shell. IDF elements described the incident as a "failed Hamas launch."
However, a subsequent IDF inquiry suggested the explosion may have occurred after a tractor had climbed over an explosive device.
The last attack from Gaza took place on Passover eve. Several hours before the Seder, a Qassam rocket fired from northern Gaza exploded in an open area near a Sha'ar HaNegev Regional Council kibbutz.
The Color Red alert sounded in the area, as well is in Sderot. No injuries or damage were reported.
Elior Levy contributed to this report
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