SPY EYES

Commonly known as "bunker busters," 2,000-pound penetrator bombs are stored on pallets in a bunker at the McAlester Army Ammunition Plant in McAlester, Okla., in this file photo. , AP Photo; Inset: Getty Images

While publicly pressuring Israel to make deeper concessions to the Palestinians, President Obama has secretly authorized significant new aid to the Israeli military that includes the sale of 55 deep-penetrating bombs known as bunker busters, Newsweek has learned.

In an exclusive story to be published Monday on growing military cooperation between the two allies, U.S. and Israeli officials tell Newsweek that the GBU-28 Hard Target Penetrators—potentially useful in any future military strike against Iranian nuclear sites—were delivered to Israel in 2009, just several months after Obama took office.

The military sale was arranged behind the scenes as Obama’s demands for Israel to stop building settlements in disputed territories were fraying political relations between the two countries in public.

The Israelis first requested the bunker busters in 2005, only to be rebuffed by the Bush administration. At the time, the Pentagon had frozen almost all U.S.-Israeli joint defense projects out of concern that Israel was transferring advanced military technology to China.

In 2007, Bush informed Ehud Olmert, then prime minister, that he would order the bunker busters for delivery in 2009 or 2010. The Israelis wanted them in 2007. Obama finally released the weapons in 2009, according to officials familiar with the still-secret decision.