The story: Contention over the blame for a deadly blast at a Christian hospital in Gaza is sharply dividing Arab states, Israel, and the United States. Gulf Arab capitals and Iraq say responsibility for the reported loss of hundreds of lives squarely lies with Tel Aviv. However, Israel and the US insist that a misfired rocket allegedly launched by Palestinian Islamic Jihad caused the explosion.

The reactions: Speaking alongside Israeli Prime Minister Benjamin Netanyahu, visiting US President Joe Biden on Oct. 18 sided  with...