HARARE: Riot police briefly stopped a press conference that was set to be held at the Bronte Hotel' in Harare on Friday. Nelson Chamisa' the leader of the MDC Alliance' was set to address journalists. It is understood that he was to provide evidence of how the election was 'rigged.' Chamisa's legal advisor said the police had disturbed the press conference as they wanted to first ensure that the gathering was of journalists and not citizens. This is a developing story.

Based on the paragraph above can we conclude that "The police did not arrest Nelson"?
It's impossible to say