Law enforcement officers have detained Irakli Absandze, the television anchor at the First Channel.
Absandze, reportedly, committed an administrative offense.
MIA said that 12 protesters were detained following the clashes with police officers.
Media solidarity rally participants marched to the Georgian Dream central office, chanting ''Go, Slaves!''
Demonstrators headed to the GD central office after the MIA publicized the interim opinion on cameraman Lekso Lashkarava's death.
The version by MIA of how Lekso Lashkarava died is inadmissible, according to protesters.
On 5 July, opponents of Tbilisi pride attacked journalists. The MIA of Georgia said that following the investigation activities, they determined that violent crimes were committed against 55 citizens, with 53 being representatives of different media outlets.
Far-right attacks were also carried out against representatives of various media outlets on 6 July.
TV Pirveli cameraman Lekso Lashkarava was physically assaulted during the 5 June developments.
The cameraman underwent treatment at New Hospitals for a few days.
Lekso Lashkarava was found dead at his own house on 11 July.
Protests against violent activities have been underway outside the parliament for two days now.