The journalist told Radio Emmanuel that some police officers arrested and detained him briefly on accusation that it was illegal for him to cover the event.
Security officials also restricted every journalist even from talking to the protesting police trainees.
The fate of Hassan Gama adds to a record to three cases of journalists facing hostility in the hands of security personnel in Eastern Equatoria state.
Two journalists, one from Radio Emmanuel and the other from the Voice of Eastern Equatoria, were manhandled by security officers at the time of political campaigns.