In Pictures

Election 2015 in pictures: 16 April

Image copyright Peter Macdiarmid-Pool/Getty Images)
Image caption Prime Minister David Cameron was north of the border to launch the party's Scottish manifesto, here with leader of the Scottish Conservatives Ruth Davidson. The Conservative Party currently has just one seat in Scotland.
Image copyright Jonathan Brady/PA
Image caption Mr Cameron said Labour and the Scottish National Party posed a clear threat to the future of the United Kingdom, saying the two parties would form "a coalition of chaos".
Image copyright Carl Court/Getty Images
Image caption In Crouch End, in London, Coco the dog waited with Labour supporters for the arrival of party leader Ed Miliband.
Image copyright Carl Court/Getty Images
Image caption Mr Miliband was on the campaign trail ahead of a televised debate with Plaid Cymru's Leanne Wood, the Green Party's Natalie Bennett, the SNP's Nicola Sturgeon and UKIP's Nigel Farage.
Image copyright Dominic Lipinski/PA
Image caption Nick Clegg took the Liberal Democrats message to the north west of England. Here in Cheadle, he said his party had identified 20 seats at risk from "Blukip" - a Tory minority government influenced by UKIP and the DUP.
Image copyright Dan Kitwood/Getty Images
Image caption Vans with the words "Liar Liar" emblazoned on the side drove around Parliament Square, part of a National Union of Students campaign aimed at MPs who broke their pledge to oppose fee increases for universities in England.
Image copyright Brian Lawless/PA
Image caption The Alliance Party of Northern Ireland launched its manifesto, Step Forward, Not Back. It calls for policies aimed at promoting community relations and reducing division. Alliance Party leader David Ford and candidate for East Belfast Naomi Long launched the manifesto at the Metropolitan Arts Centre in Belfast.