Updated

Zimbabwean senior opposition official Tendai Biti has been arrested while trying to cross into Zambia, a lawyer said 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.

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 has denounced the election win of President Emmerson Mnangagwa as fraudulent and vowed to challenge it in court this week.

Last week Biti declared, before official election results were announced early Friday, that opposition leader Nelson Chamisa had won the vote, a claim also made by Chamisa himself.

The Zimbabwe Electoral Commission has said it is illegal to announce results before its own official pronouncement.

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. Chamisa lawyer Thabani Mpofu told reporters on Wednesday they will file the challenge within the prescribed timeframe. That would push back an inauguration that Mnangagwa's administration already had planned for Sunday.

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 ouster of former leader Robert Mugabe 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," Biti said at a forum on Zimbabwe held in Johannesburg in late June.

"We had a coup in November," 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."

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