Israel has between 100 and 300 nuclear warheads, making it the world’s sixth largest nuclear power, say defense analysts at the London-based Jane’s Information Group ahead of a nuclear summit to be hosted by US President Barack Obama in Washington this week.

According to the publishing company, the size of Israel’s nuclear arsenal puts it almost on par with Britain. Israel reportedly can fire nuclear warheads on an array of surface-to-surface Jericho missiles and on top of cruise missiles carried by its Dolphin-class submarines, giving it a second-strike capability.

The Jericho 2, says Jane’s, has a range of about 4,500 km. The Jericho 3, reportedly tested by Israel several years ago, is said to have a range of close to 8,000 km. Israel can also deploy nuclear missiles from the air.

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The Jane’s analysis, as quoted by AFP, says Israel has also developed tactical nuclear weapons and probably keeps most of its arsenal in an unassembled mode, reserving the ability to obtain fully-functional weapons within a matter of days.