Lobby groups said at least eight people were killed and 400 injured in the protests.
Police clashed with protesters in the capital Nairobi and other cities.
Police fired teargas canisters at hundreds of youths who had turned up for the protests.
Authorities deployed tear gas to disperse crowds and barricaded major roads leading into various towns.
The Group said the NTV signal was unconstitutionally switched off by the Communications Authority of Kenya (CA).
A load-carrying TukTuk and a grader were also set ablaze by the protestors in the station.
Armed with flags and placards, protesters peacefully traversed through Mombasa towns.
The Commission said police bear the responsibility of maintaining law and order while safeguarding the rights and lives of all persons, including protestors.
The protests are in remembrance of the youthful Kenyans who lost their lives protesting against the Finance Bill of 2024.