A Hamas operative was killed on Sunday in an explosion along Gaza's fence with Israel, the group said. The Islamic group's military wing said the member was killed, and another injured, during a "holy mission." Such language is used when explosives meant for an attack on Israel explode prematurely. The IDF said it was not operating in the area at the time of the explosion early Sunday. Fighting has escalated since 48-year-old Jimmy Kedoshim was killed in a mortar shell attack on southern Israel on Friday. In retaliation, IDF forces fired missiles that killed five Hamas operatives.