Sinn Féin's Martin McGuinness announces his resignation as Deputy First Minister of Northern Ireland.

The move will likely lead to a snap Assembly election.

Mr McGuinness announced his decision after his partner in government, DUP First Minister Arlene Foster, repeatedly refused to step down to facilitate a probe into the ill-fated Renewable Heat Incentive (RHI) - a scheme that has left Stormont facing a £490m overspend.