Supporters of the opposition Movement for Democratic Change party (MDC) of Nelson Chamisa, sing and dance in the street outside the party`s headquarters following general elections in Harare, Zimbabwe, on 31 July 2018. — ReutersOpposition leader Nelson Chamisa claimed victory in Zimbabwe’s disputed presidential election on Thursday as an anxious nation awaited an official announcement of the result three days after voting.Chamisa said president Emmerson Mnangagwa knew he had lost otherwise the results would have been announced by now.International observers urged the electoral commission to release results as soon as possible to avoid further violence after three people were killed on Wednesday in clashes between security forces and opposition supporters.The commission said it would start announcing the results of the presidential election – Zimbabwe’s first since the army ousted Robert Mugabe last November to end four decades of authoritarian rule – from 10 p.m. local time (2000 GMT).Earlier on Thursday, police sealed off the headquarters of Chamisa’s Movement for Democratic Change (MDC) and troops cleared the streets of the capital, despite calls from foreign governments and international organizations for calm and for political leaders to show restraint.In his first public appearance since the vote on Monday, Chamisa urged his supporters to be calm and await “massive celebrations” for his victory. He could not give any figures because he would be breaking the law, he said.“This government does not respect life,” he told reporters.“Mr Mnangagwa knows it that he has lost this election. If he had won this election the result will have been announced long back but they are trying to massage the figures to try to advance fictious and fallacious results. We know the results.”On Wednesday, Chamisa accused the ruling ZANU-PF party of rigging the poll, although he offered no evidence.Opposition supporters took to the streets to demonstrate and three were shot dead by soldiers amid clashes.The army crackdown has punctured the euphoria that followed its removal of Mugabe, and fueled suspicions that the generals who launched the coup remain Zimbabwe’s de facto rulers.Britain calls for getting troops off streetsAFP reports from London: Britain told the Zimbabwe government on Thursday that the military should be taken off the streets of Harare after a fatal crackdown on demonstrators following the presidential elections.Soldiers and police cleared the streets of the city centre a day after the clampdown, as the Zimbabwean authorities begged for patience over the release of the election results.”We condemn the excessive use of force by the security forces towards demonstrators,” the British embassy in Harare tweeted in a statement.”The British ambassador met government ministers yesterday and again today and made clear that the military should be removed from the streets of Harare and the security forces should act with the utmost restraint.”The vote — the first since autocrat Robert Mugabe was ousted last year — turned bloody on Wednesday when troops opened fire on demonstrations against alleged electoral fraud, leaving three dead and prompting an international outcry.”We welcome the statement by the president that there will be an independent investigation and we look forward to this being implemented quickly,” the British embassy statement said.”Zimbabwe is experiencing a period of heightened tension around the presidential election. All political leaders have a responsibility to ensure they do not raise tensions or issue statements that make violence more likely.”Britain is the former colonial power in Zimbabwe, which gained its independence in 1980 under Mugabe.