Democratic presidential hopeful Hillary Clinton threatened to "obliterate" Iran if it launches a nuclear attack on Israel, in an interview broadcast Tuesday.

"I want the Iranians to know that if I'm the president, we will attack Iran," Clinton told ABC News, asked what she would do as president were Iran to launch a nuclear attack on Israel.

"In the next 10 years, during which they might foolishly consider launching an attack on Israel, we would be able to totally obliterate them."

The tough talk came just prior to Tuesday's Pennsylvania primary, a key milestone in the marathon Democratic nominations race pitting Clinton against her rival Senator Barack Obama.

Clinton must win the Pennsylvania primary, but she needs to do more than simply scrape past Obama to rescue her trailing White House bid, pundits say.

Obama's camp Monday accused Clinton of trying to scare voters, as she rocked their White House race with a dark campaign ad featuring images of Al-Qaeda mastermind Osama bin Laden.

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