[RegulatorCountry]

"I think is sounds like the it's the cop saying O.B., O.B., come on up, come up"

I heard "OB, OB, open up, open up."

[drpix]

I hear the "Allah Akbar"s before the single shot. (The double shot is earlier). AFTER the single shot, I hear the "come on up"s - possibly "open up"s.

[Sudetenland]

I listened again and it sounds like:

"Police! Hold 'em up! O. B., O.B.! Come on up! Come on up! Come on-BANG! Hurry up! [something like] Through way! [then] Come on up, come on up!" Then the film shows two more officers advancing. Some more police comments then a whole lot of gunfire.

My best guess.