Israel security officials are expected to announce a dramatic breakthrough Sunday in the investigation of the Itamar massacre, in which five members of the Fogel family were stabbed to death in their West Bank home.

Israel Defense Forces Chief of Staff Benny Gantz met with the three surviving member of the Fogel family on Friday, Tamar, Roey and Yishai. The three children, accompanied by other family members, were invited to the chief of staff's office, where Gantz presented them with a Passover Haggadah.

The chief of staff updated the Fogel children on the developments in the investigation.

Earlier this month, terrorists entered the West Bank settlement of Itamar, stabbing and murdering Ehud and Ruth Fogel, along with three of their young children, including their three-month-old baby, before fleeing the scene.

Since the murders a month ago, the IDF and the Shin Bet has arrested dozens of residents of the village of Awarta, which is located near the West Bank settlement of Itamar. Several suspects were released following a brief investigation, and others are still undergoing investigation.

Investigations have revealed that the murderers climbed the electronic fence that surrounds the settlement and entered Itamar. After they committed the murder they escaped using the same route.

The gate alerted local civil security officials of the breach, but after checking the perimeter and not seeing anything unusual, it was decided not to do anything. The murderers were in the settlement for over two hours.

Evidence shows that the murderers may have escaped to the neighboring village of Awarta. There are indications that the murderers acted alone and were not affiliated with any terror organization.