Opposition voices have been largely stifled since the colonels seized power in a 2020 coup, overthrowing civilian president Ibrahim Boubacar Keita.
Mali's high authority for communication issued a statement Thursday calling on "all media (radio, television, written press and online) to halt broadcast and publication of the activities of political parties and the activities of a political nature of associations."
The statement did not indicate what would happen to media organizations that did not observe the ban, AFP said.
The move comes after authorities on Wednesday ordered the indefinite suspension of all political activities, saying it was needed to maintain public order.
Government spokesman Colonel Abdoulaye Maiga blamed the suspension of party activities on the "sterile discussions" during an attempt at national dialogue earlier this year.
"Subversive acts by political parties are multiplying," a decree read out to reporters by Maiga said.
He added that the fight against armed jihadist and Tuareg separatist groups could not be reconciled by "sterile political debates."
The latest crackdown has prompted numerous comments on social media but there has so far been little reaction from parties or leading figures, already largely silenced.
Moussa Mara, who was prime minister from 2014 until 2015, urged authorities to reverse the decision, calling it a "major step backwards" that "does not promise a peaceful future."
The president of the Convergence for the Development of Mali (CODEM) party, Housseini Amion Guindo, called for "civil disobedience until the fall of the illegal and illegitimate regime... due in particular to its inability to satisfy the essential needs of Malians."
Under pressure from regional bloc, the Economic Community of West African States (ECOWAS), the junta had promised to hold elections and hand power back to civilians by March 26, 2024, but no vote was organized.
The United Nations voiced alarm Thursday at the junta's move to suspend political activities.
"We are deeply concerned by the decree suspending the activities of political parties and other civic associations," the UN rights office said on X, formerly Twitter, insisting that "it must be immediately repealed."
'Return to the barracks'
Since August 2020, Mali's opposition has been largely muzzled by legal woes, the dissolution of organizations, restrictions on press freedom and calls for national unity.
But in a rare joint statement on March 31, a number of political parties and civil groups decried the "legal and institutional vacuum" left by the failure to hand back power to civilians on March 26.
They called for a "rapid and inclusive dialogue" to ensure that the presidential election is held "as soon as possible."
In a separate statement on the same day, a group of human rights organizations said that Mali had "reached an impasse" and that it was time for the military "to return to the barracks."
Since seizing power in 2020, the junta has ended several international alliances, including with the European Union and former colonial power France, and instead fostered closer ties with Russia.
The military government last year ordered the withdrawal of the UN stabilization mission, MINUSMA, and in January ended a 2015 peace agreement with separatist groups in the north.
The worsening security situation in Mali has also been compounded by a humanitarian and political crisis.
Neighboring Sahelian states Burkina Faso and Niger also underwent military coups in 2022 and 2023 respectively.
The three countries have all pledged to leave ECOWAS in favor of their own Sahel alliance.