Two Ugandan journalists, who were arrested following Monday's violence, have been released on a police bond and are alleged to have been tortured by authorities.

Herbert Zziwa and Ronald Mwanga were "violently arrested by armed men in military fatigues while reporting live on air", their employer NTV Uganda said in a statement.

NTV Uganda says the journalists were taken to an unidentified location and "physically assaulted repeatedly".

Both men were charged with incitement of violence and malicious damage before being released on Tuesday.

NTV Uganda condemned their "torture and unjustified detention" and plans to "robustly defend them against these charges".

Police said on Monday opposition supporters pelted the convoy of President Yoweri Museveni with stones.

Security officers then intervened. The ensuing clashes killed the driver of musician-turned-opposition leader, Robert Kyagulanyi, popularly known as Bobi Wine.

Among those arrested were Ugandan opposition MPs, including Me Kyagulanyi, and dozens of other people.