Another airstrike killed two Hamas militants in Khan Yunis, in southern Gaza, Palestinian officials said.

CNN: At least 4 Palestinians killed in Israeli ground assault

The Palestinian was killed by Israeli helicopter fire east of Khan Yunis, near the border fence with Israel, about 90 minutes later.

CNN: Week-old Gaza cease-fire is breached

Housam Hamdan and Mohammed Hilou -- both senior members of the Izzedine al-Qassam Brigades -- were killed in an airstrike in Khan Yunis in southern Gaza, Hamas sources said.

CNN: Israeli troops push forward, splitting Gaza