Zimbabwean President Robert Mugabe and his wife Grace attended the 21st Movement Celebrations to mark his 93rd birthday celebrations at Matopos National Park in Mateleland South, Zimbabwe, Feb. 25, 2017. (Xinhua/Stringer)

JOHANNESBURG, Nov. 14 (Xinhua) -- South Africa's ruling African National Congress (ANC) on Tuesday expressed concern about the instability in Zimbabwe while dismissing intervention proposals.

Gwede Mantashe, general secretary of the ANC, made the remarks when responding to media inquiry at a press conference in Johannesburg.

Zimbabwean president Robert Mugabe fired his deputy Emmerson Mnangagwa last week. On Monday Zimbabwe's army commander general Constantine Chiwenga said the military will "step in" if the revolution is under threat.

"We are obviously concerned as it impacts on us," said Mantashe, while noting it is the Zimbabwean government and Zimbabwe's ruling party Zanu-PF to deal with the issue.

The ANC and Zanu-PF have relations dating back to the liberation struggle. They meet periodically to discuss issue of mutual cooperation.