In the Middle East, two assassinations in less than 24 hours could transform the region. Israel claimed responsibility for one. It has no comment on the other.

First, an Israeli attack in Lebanon killed a leader of the militant group Hezbollah. Just hours later, the political leader of Hamas was killed in Iran.

The Hamas leader Ismail Haniyeh was attending the swearing-in for Iran's new reformist president. Hamas says Haniyeh was killed by a rocket fired into his room at an official residency. Hamas and Iran both blame Israel for the attack.

When Israeli Prime Minister Benjamin Netanyahu spoke after the two killings, he did not claim responsibility for the attack in Tehran. He did describe the Israeli strike in Beirut as a crushing blow.

In Washington, White House spokesman John Kirby expressed concern the assassinations could result in an escalation of the conflicts already playing out.

Two assassinations in the Middle East have the potential to start a violent chain of retaliations. Will they?

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