police in uganda put the main opposition candidate for president underhouse arrest. it's the fourth time in a week that he has been detained. police say it's to prevent unrest after the opposition vote rigging in the poll on thursday. professional results showed that the president is on course to extend his 30 year rule. the e.u.'s chief observer for the elections says the extent of force used by the police is unacceptable. >> it was not transparent. it was very badly organising things. and it took the trust of everyone here in uganda that we were speaking to. i would say it's a failure of the european commission. vote stuffing or rigging. we got that information from the media. we ask our observers all over the country, and i have to say that they did not confirm - they didn't witness any kind of these things which you mentioned. i speak on the findings that they had in the region there. >>> live to kampala and al jazeera's correspondent. in a week or so when the dust settles, difficult to see how the election will be reviewed as being completely free and fair. >> l