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(NEWSER) – Two Palestinians armed with knives, axes, and guns stormed a Jerusalem synagogue today, killing four people before dying in a shootout with police, officials say. The dead included three dual US-Israeli citizens and one British-Israeli citizen, all of them rabbis, reports CNN.

Israeli police called the incident a terrorist attack and said the two Palestinian assailants were cousins from east Jerusalem. Because of the involvement of Americans, the FBI will investigate. The attack was the deadliest in Jerusalem in years and is bound to ratchet up fears of sustained violence in the city, already on edge amid soaring tensions over a contested holy site.

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