Zimbabwe opposition leader Morgan Tsvangirai has been released by police after being detained for two hours.
It was the third time that Mr Tsvangirai, hoping to topple veteran President Robert Mugabe at a run-off election on 27 June, has been detained by police in the last eight days.
The opposition and human rights groups accuse Mr Mugabe's government of waging a campaign of arrests and violent intimidation ahead of the run-off with Mr Tsvangirai.
He and his entourage of 20 people were detained at a roadblock outside of Kwekwe, 200km west of Harare, while conducting a campaign tour through Midlands province.
Earlier today, police arrested the party's secretary general at Harare airport as he flew in from South Africa.
Police said MDC secretary general Tendai Biti was wanted in connection with prematurely announcing the results of the first round of voting.
Mr Biti is to be charged with treason, a police spokesman said.
The party's number three left the country soon after disputed March 29 elections to gather African support.
The MDC says ZANU-PF activists have killed 66 opposition supporters to try to intimidate voters before the run-off. The ruling party blames the opposition for the political violence.
