Zimbabwean senior opposition official Tendai Biti has been arrested while trying to cross into Zambia, a lawyer said on Wednesday, as concerns rose over a government crackdown after last week's disputed presidential election.
Lawyer Nqobizitha Mlilo said more details would be released later.
Mr Biti, who was finance minister in an uneasy coalition government from 2009 to 2013, is a leading member of the opposition Movement for Democratic Change party, which denounced the election victory of President Emmerson Mnangagwa as fraudulent and vowed to this week challenge it in court.
Last week Mr Biti declared, before official election results were announced early on Friday, that opposition leader Nelson Chamisa had won the vote, a claim also made by Mr Chamisa. "In a normal country Chamisa would be sworn in right now," Mr Biti told reporters a day after the election.
The Zimbabwe Electoral Commission had said it is illegal to declare results before its own official announcement.
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Mr Mnangagwa was more restrained than the opposition during the vote count, saying only that the situation looked positive. However, some reporting in state-run media emphatically declared him the winner before the official results were out.
The opposition has seven days from the announcement of the official election results to file a court challenge.
Mr Chamisa's lawyer Thabani Mpofu told reporters on Wednesday they will file the challenge within the prescribed time frame. That would push back an inauguration that Mr Mnangagwa's government already had planned for Sunday.
Mr Biti was named along with Mr Chamisa in a search warrant issued last week that said they and several others were suspected of the crimes of "possession of dangerous weapons" and "subversive material" as well as "public violence", according to a copy of the warrant seen by The Associated Press.
Police raided the opposition party headquarters a day after the military rolled into the capital, Harare, and dispersed protesting opposition supporters with gunfire. The supporters were angry over the announcement that the ruling party had won a majority of seats in parliament, and some were rioting. Six people were killed, including a woman who was shot in the back.
International election observers and Human Rights Watch have condemned the violence and intimidation against opposition supporters that have continued into this week and have urged security forces to use restraint.
Mr Biti, one of the most vocal critics of the government, had said months before the election that the Zimbabwean military was casting a shadow over hopes for genuine reform in the southern African nation.
He said that while the removal of former leader Robert Mugabe after 37 years in power was welcome, the military takeover that led to his resignation in November set a dangerous precedent for further involvement of generals in civilian affairs.
"The genie is out of the bottle," Mr Biti said at a forum on Zimbabwe held in Johannesburg in late June.
"We had a coup in November," Mr Biti said at the time. "We didn't seek to understand what it meant and we didn't carry out political reform to make sure that another coup does not happen."
