"Those who carried out the kidnapping of our youngsters are Hamas people," Mr Netanyahu said 醫療用品.

Mr Netanyahu pointed to the fact that Palestinian President Mahmoud Abbas recently announced a unity government backed by Hamas.

Israel suspended crisis-hit peace talks with the Palestinians when the government was announced and insists it will not deal with a Palestinian government backed by Hamas 村屋二按.

Hamas spokesman Sami Abu Zuhri called Mr Netanyahu's statements "silly" and said the arrests of Hamas figures were "aimed at breaking the will of the Hamas movement in the West Bank".

The Israeli army says it has arrested about 80 Palestinians in the search for the teenagers.

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Israel has bolstered its army presence, as Quentin Sommerville reports

Analysis: Quentin Sommerville, BBC News, Jerusalem

Israel is gripped by the fate of three teenagers, who were returning from lessons at a seminary when they disappeared.

The suspicion is that they were kidnapped. Prime Minister Benjamin Netanyahu is certain they were taken by Hamas. The Islamist militant group dismissed the accusation 耳穴戒煙.

Hamas kidnapped Israeli soldier Gilad Shalit in 2006 and held him for five years. As prime minister then, Mr Netanyahu authorised the freeing of more than 1,000 Palestinian prisoners to secure his release.

The fear here is that if the teenagers aren't found, the situation could escalate significantly. Israel says its forces are standing by for "any possible scenario". Palestinians say that would amount to collective punishment.