Election 2015: DUP votes 'may be vital' in forming government

The DUP has said it believes its votes could be vital in the formation of the next UK government.

Launching its manifesto, the party again ruled out taking part in any future coalition, but added the DUP would be prepared to support a party whose proposals would be in the best interests of Northern Ireland and the UK.

BBC News NI Political Editor Mark Devenport reports.