The Israeli army says it has arrested about 80 Palestinians as part of efforts to return three Israeli teenagers missing from the West Bank.
Israel said on Saturday that the three had been kidnapped by a "terror group".
The students went missing near an Israeli settlement north of Hebron on their way back from evening lessons.
The disappearance is being seen as the biggest strain on relations between the two sides since a Palestinian unity government was announced in April.
Israel says an "intensive operation" is under way to find the two 16-year-olds and one 19-year-old.
Palestinian officials have said they are co-operating with the search.
The teenagers have been identified as Naftali Frenkel, Gilad Shaar - both 16 - and Eyal Yifrach, 19.
Read More: http://www.bbc.co.uk/news/world-middle-east-27855994
When are the Pali fools going to learn? Bombs, missiles, shootings - fine, it's part of life. But you never, ever, ever touch a kid. Israelis are a wee bit bothered by that, to put it politely.