The United Nations said on Wednesday that Israel's decisions to impose up to 20 years prison for people throwing stones and to force-feed prisoners on hunger strike threatened to worsen an "already-precarious human rights situation."UN political affairs chief Jeffrey Feltman also told the UN Security Council he was concerned about Israel's decision to extend the use of prolonged administrative detention and called for all detainees to be promptly charged or released.Israel's security cabinet on Aug. 2 extended to its own citizens so-called "administrative detention", a practice commonly applied to Palestinian militant suspects and condemned internationally.The change laid bare authorities' frustration at failing to curb Jewish ultra-nationalist attacks and followed the lethal torching of a Palestinian home.Feltman said that this attack and many others over the years, including against Israeli settlers, happened in the context of "a chronic lack of adequate law enforcement.""Such violence is possible because of the environment created as a result of Israel's decades-long policy of illegal settlement activities," he said.Last month, Israel's parliament imposed tougher penalties of up to 20 years prison for people throwing stones at vehicles and roads and authorized force-feeding of prisoners on hunger strike. "Careful consideration should be placed on addressing the underlying human rights concerns which lead prisoners to such extreme protests, including prolonged administrative detention," Feltman said.He said that the law on stone-throwing was "likely to affect children disproportionately."."The risk of escalation in Israel and Palestine is palpable," Feltman said."The past month has witnessed unconscionable crimes of hatred by extremist elements, reprehensible retaliatory violence, provocations at Jerusalem's holy sites, and a worrying increase in rockets launched from Gaza towards Israel," he said.