The plot is said to be orchestrated by the Zanu PF faction led by Defence Minister Emmerson Mnangagwa.
Prime Minister Morgan Tsvangirai, has already sounded that a coup has taken place in Zimbabwe, he is meeting South African President Jacob Zuma to brief him on the deteriorating political situation in Zimbabwe.
Unconfirmed reports from Harare said Zimbabwe coalition government’s co-Home Affairs Minister Theresa Makone has also been arrested.
Theresa Makone is from the MDC, which joined President Robert Mugabe and his Zanu-PF party in a unity government in 2009 after years in opposition.
In the morning before her arrest she said that Zanu-PF wants to stop her and other MDC MPs voting in next week’s election for a speaker of parliament.
Tension is again rising in Zimbabwe ahead of possible elections this year.
Ms Makone said she had been told that another MP and Lovemore Moyo, the former speaker of parliament, also faced arrest.
Zimbabwe’s Energy Minister Elton Mangoma was earlier arrested for a second time this month.
The 2008 election of Mr Moyo as speaker of parliament was nullified by the Supreme Court two weeks ago, following a complaint by a Zanu-PF official.
This afternoon a source said most MPs and cabinet Ministers from the MDC led by Prime Minister Morgan Tsvangirai have gone into hiding.
Ms Makone accuses Zanu-PF and their allies in the security forces of trying to prevent MDC MPs from voting, to ensure their candidate wins the new election.
Both the MDC and Zanu-PF are locked in a tight battle to control parliament.