Security forces arrested a number of residents of the West Bank city of Nablus overnight between Friday and Saturday, on suspicion of being linked to Thursday's deadly shooting attack in which terrorists murdered Eitam and Na'ama Henkin in their car.The arrest operation was carried out by the Shin Bet domestic intelligence agency together with the IDF and Israel Police. The forces moved into the Palestinian city, located some five kilometers northwest of the scene of the deadly terror shooting, and made several arrests of security suspects. "In the past 24 hours, there has been a significant development in the investigation," the Shin Bet revealed on Saturday evening. "The investigation continued, and a media ban is in place on all other details of the investigation," it added. The IDF has deployed four battalions to the West Bank to take part in searches for the terror cell, and respond to the deteriorating security situation.The hunt for the terrorists is being led by the Shin Bet.