Armed forces also destroyed two cars used by the militants
During the raid yesterday, the source said.
The three militants were hiding in a farm that belongs to an Ansar Beit el-Maqeds (Jerusalem supporters) leader, who was accused of shooting down a military helicopter and killing its five soldiers crew eight months ago, the source said.
Ansar Beit al-Maqdis, a dominant militant group based in Sinai has claimed responsibility for a series of attacks on police and soldiers.