The family of Al Jazeera journalist Shireen Abu Akleh said Monday they were “incredulous” after the US reported it was not possible to determine whose gun fired the bullet which killed her. The condemnation from the family of the prominent Palestinian-American reporter came after Israel said that its experts rather than American ones examined the bullet that killed Abu Akleh on May 11. “With respect to today’s announcement by the State Department — on July 4, no less — that a test of the spent round that killed Shireen Abu Akleh, an American citizen, was inconclusive as to the origin of the …