Authorities investigating Wednesday night’s stabbing of an NYPD officer in Brooklyn say body-worn camera video recorded the suspect yelling “Allahu Akbar” three times during the attack, NYPD officers said Saturday. Deputy Commissioner for Intelligence and Counterterrorism John Miller says there are many unknowns behind the possible terror-inspired attack, including the suspect’s motive. The man behind the alleged attack, Dzenan Camovic…