Charges sought against alleged leaders of al-Qaeda and Islamic State affiliates.
Ex-Islamic minister Dr Shaheem accused of lying to inquiry commission.
The commission posted video footage of the male suspect.
Several buildings were raided as armed soldiers patrolled the capital.
The journalist was killed by a local al-Qaeda affiliate, an inquiry commission concluded.
Rilwan was beheaded and his body was sunk, a presidential commission found.
The group recruits locals to fight in Syria.
The murders of a moderate scholar, blogger and the abduction of a journalist were connected.