Since the youths disappeared from a hitchhiking stop in the southern West Bank on June 12, Israel has rounded up hundreds of Palestinians in a bid to find them, while also crushing the West Bank network of Islamist movement Hamas, which it accuses of abducting the teens.
Troops have also killed four Palestinians in the crackdown in the past week, and today the United Nations called the deaths in the security sweep "alarming".
"As the search for the missing youth continues, we call for restraint in carrying out the security operations in strict compliance with international law, and avoiding punishing individuals for offences they have not personally committed."
"We nevertheless find Hamas statements glorifying the perpetrators of this act to be outrageous," he said, referring to initial Hamas praise of the alleged kidnapping as a form of resistance.
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There has been no claim of responsibility and no sign of the missing youngsters, although military spokesman General Motti Almoz said yesterday that all information indicated they "are alive".
But Israeli security forces rounded up a further 37 Palestinians in the West Bank overnight, the army said.
"Overnight, the forces detained 37 suspects and searched 80 locations, specifically in the area north west of Hebron, Beit Awwa (southwest of Hebron) and also in (the northern city of) Jenin," an army spokeswoman said.
So far, troops have arrested 361 people, among them 250 Hamas members and 57 who were freed during a 2011 prisoner swap deal to secure the release of Gilad Shalit, a soldier held in Gaza for five years by Hamas, the army said.