Israeli Strike Planned?

The London Times reports that Israel is drawing up plans for a strike against Iran’s nuclear facilities that would set the Iranian nuclear program back indefinitely. The strike supposedly would use small nuclear weapons to break through the concrete and rock protecting Iran’s underground facilities.
The Times’ article purports to be based on information from Israeli and American sources. So the obvious question is, what lies behind the apparent leaks? Are they sanctioned by the Israeli government, perhaps with a view toward deterring Iran’s further weapons development? Do they come from renegade sources who want pressure brought to bear on the Israelis not to carry out a military mission? Or are the leaks some other kind of misdirection intended to confuse Iran?
I have absolutely no idea. But the Israeli sources quoted by the Times say that the Mossad believes Iran may have nuclear weapons within two years. So events may be moving toward a crisis.