Israeli PM Benjamin Netanyahu has cancelled a visit to the US where he was to attend a summit on nuclear security, Israeli officials say.

以色列总理内塔尼亚胡取消参加美国举行的核安全峰会。

Israel has never confirmed or denied that it possesses atomic weapons

Mr Netanyahu made the decision after learning that Egypt and Turkey intended to raise the issue of Israel's presumed nuclear arsenal¹（核军火库） , media reports said.

Mr Obama is due to host dozens of world leaders at the two-day conference, which begins in Washington on Monday.

Israel has never confirmed or denied that it possesses atomic weapons.

"The prime minister has decided² to cancel his trip to Washington to attend the nuclear conference next week, after learning that some countries including Egypt and Turkey plan to say Israel must sign the NPT（不扩散核武器条约） ," Reuters news agency quoted a senior Israeli official as saying.

Israel's Intelligence and Atomic Energy Minister Dan Meridor will take Netanyahu's place in the nuclear summit, Israeli radio said.

More than 40 countries are expected at the meeting, which will focus on preventing the spread of nuclear weapons to militant³（好战的） groups.

Landmark⁴ treaty

Israeli reports said there were concerns that Egypt and Turkey would call for Israel to sign the nuclear Non-Proliferation Treaty (NPT).

Along with India, Pakistan and North Korea, Israel is one of just four states that have not signed up to the NPT, which has 189 signatories.

Earlier this week, President Obama unveiled the new Nuclear Posture⁵ Review - which narrows the circumstances in which the US would use nuclear weapons - outlining his country's long-term strategy of nuclear disarmament（裁军） .

On Thursday, the US president and his Russian counterpart, Dmitry Medvedev, signed a landmark nuclear arms treaty in the Czech capital, Prague.

That treaty commits the former Cold War enemies to reduce the number of deployed⁶ strategic warheads to 1,550 each - 30% lower than the previous ceiling（天花板，上限） .

The BBC's Kim Ghattas in Washington says the cancellation⁷ of Mr Netanyahu's Washington visit comes at a time of frosty（严寒的，冷淡的） relations between the two states.

The Israeli premier⁸ failed to see eye-to-eye with Mr Obama during his most recent US visit last month on the stalled（失速的） Israeli-Palestinian peace process, our correspondent adds.

Washington criticised the building of Jewish homes in East Jerusalem, which prompted the Palestinians to pull out of US-brokered indirect peace talks.

There were also reports that one of Mr Netanyahu's confidants（密友，知己） called Mr Obama a "disaster" for Israel.