and prevented vehicles and pedestrians from leaving or entering, according to Palestinians. Residential areas were placed under curfew, and Israeli troops conducted house-to-house searches. The previously-dismantled Huwwara Checkpoint was re-established. An initial probe suggested two perpetrators entered Itamar shortly after 9 pm, jumping over the settlement's security fence, and remained in the settlement for three hours without being noticed. Due to the characteristics of the killings, the IDF estimated that the attack was not carried out by an organized terrorist infrastructure but was the work of one or two people, presumably Palestinian. Israeli authorities initially suspected that the killings may have been in revenge for the killing of two Palestinian teenagers from Awarta, who were shot dead near Itamar in 2010. In Itamar, the Fogel family home was cordoned off by red tape and guarded by soldiers. A forensics team probed the home, collecting evidence left behind by the killers. An IDF tracker spotted indications that the perpetrators had scaled the fence, and found footprints and equipment abandoned by the killers leading out of Itamar. The tracker, accompanied by an IDF force, followed the tracks to the Palestinian village of Awarta. IDF troops entered the town of Burqa, northwest of Nablus, searching houses and questioning residents. They did not make any arrests. IDF soldiers and Israel Border Police gendarmes also entered the villages of Sanur and Zababdeh, arresting several dozen Palestinians. A gag order was imposed on the investigation. Awarta was placed under curfew and declared a closed military zone. IDF troops and Israel Border Police conducted mass arrests of residents throughout the following days. According to Palestinian sources, all men from Awarta were questioned. Residents reported constant door-to-door searches, with some homes being searched up to three times. According to witness reports, Israeli armored vehicles patrolled the village's streets, and troops were deployed on the hilltops around the village. The city of Nablus remained under closure, but four days after the murders, a food delivery was permitted into the city. On 29 March 2011, the IDF initiated a second wave of arrests in Awarta, detaining 60 Palestinians, including the Deputy Mayor of Awarta, and collecting DNA samples. About 20 were immediately released following DNA testing, and another 40 were interrogated. A week later, AFP reported that the IDF arrested more than 100 women from the village, placing them in a camp where they were fingerprinted and DNA samples were