Opposition leader Morgan Tsvangirai has been released without charge from police custody in Zimbabwe.
He was released after 'extensive questioning' by police, party lawyer Job Sibanda said.
Several top lieutenants held along with him were also freed.
Earlier, the EU presidency had called on Zimbabwean authorities to immediately release Mr Tsvangirai.
He was detained by police in the southwestern city of Lupane.
Amid preparations for the run-off presidential election on 27 June, a Movement for Democratic Change spokesperson confirmed that he had been detained at a roadblock while campaigning.
The MDC has faced severe restrictions in its campaigning efforts and Morgan Tsvangirai has been largely prevented from addressing party rallies.
'We are currently held up. They are not saying why they are holding us up. It's not an arrest but illegal detention' said MDC spokesman George Sibotshiwe.
Others arrested included the party's deputy leader Thokozani Khupe and MDC chairman Lovemore Moyo.
The MDC said in a statement that Mr Tsvangirai had initially been stopped by police on a slip road while driving in the Lupane area and held for some two hours before being transferred to a police station.
Mr Tsvangirai has been arrested on a number of occasions and twice been charged with treason.
The former union leader suffered head injuries in March last year after being assaulted by the security forces as he tried to stage an anti-government rally in the capital Harare.
