Chris Gard and Connie Yates announce decision as high court judge was preparing to oversee latest round of five-month legal battle.
Charlie Gard: Timeline of parents' legal battle
3 March 2017: Mr Justice Francis starts to analyse the case at a hearing in the Family Division of the High Court in London.
11 April: Mr Justice Francis says doctors can stop providing life-support treatment.
3 May: Charlie's parents ask Court of Appeal judges to consider the case.
23 May: Three Court of Appeal judges analyse the case.
25 May: Court of Appeal judges dismiss the couple's appeal.
8 June: Charlie's parents lose fight in the Supreme Court.
20 June: Judges in the European Court of Human Rights start to analyse the case after lawyers representing Charlie's parents make written submissions.
27 June: Judges in the European Court of Human Rights refuse to intervene.
3 July: The Pope and US President Donald Trump offer to intervene.
7 July: Great Ormond Street Hospital applies for a fresh hearing at the High Court.
24 July: Charlie's parents end their legal fight to take him to the US for treatment.
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