The US Federal Bureau of Investigation (FBI) has opened an investigation into the killing of Palestinian journalist Shireen Abu Akleh, Israel confirmed on Monday. Israeli Defence Minister Benny Gantz condemned the probe as a “grave mistake” on Twitter, vowing that Israel “won’t cooperate with any external investigation.” Palestinian officials, Abu Akleh’s family and Al Jazeera accuse Israel of intentionally targeting and killing the 51-year-old journalist, a US citizen who was wearing a helmet and a protective vest marked with the word ‘press’ when she was shot last May in the occupied West Ba…