Soldiers are reported to have taken over the headquarters of Zimbabwe’s national broadcaster, ZBC, amid a growing political crisis
Explosions have also been reported in the capital, Harare.
Earlier, the country’s ambassador in South Africa denied talk of a coup.
It comes as Zimbabwe’s ruling party accused the country’s army chief of “treasonable conduct” after he warned of a possible military intervention.
General Constantino Chiwenga had challenged President Robert Mugabe after he sacked the vice-president. Gen Chiwenga the army was prepared to act to end purges within Mr Mugabe’s Zanu-PF party.
Tensions were raised further on Tuesday when armoured vehicles were seen taking up positions on roads outside Harare.