SO many things about this incident don't 'jell'.
We could assume that the 'security' was kept outside and only came in later and shot the perp. I guess they had to wait until he (the perp) finished his 'speech'.
I have read that the assassin used a FAKE POLICE ID to get through the 'security' (metal detectors?). I have also read that he WAS a COP.
If they wanted NO SECURITY in the ROOM where the artwork and speech by the Ambassador was, why would they let a COP in with a GUN ?
He was a real cop, had been part of Erdogan’s sec.cops. Erdogan purged all the police chiefs in 2013 and replaced them with Islamists. The current head chief of Police in Turkey has been photographed with the head of Al Nusra.
Good discussion with lots of info on this thread.
The poster on comment 132 has many valuable comments throughout the thread.