Senior Labour figures rounded on Ed Miliband over his "complacency" in Scotland as a poll found that the Scottish National Party is on course to win every seat north of the border.
Former Scottish Labour leader and first minister Henry McLeish said Miliband had been kept in the dark by his MPs about the scale of the disaster facing the party there.
The New Statesman said the surge of support for the SNP had "definitively ended Mr Miliband's hopes of winning an absolute majority".
An Ipsos-Mori survey for STV News suggested the SNP is on course to win all 59 Scottish seats - an unprecedented feat that would force some of Miliband's closest allies out of office.
Miliband was interviewed by anti-capitalist comedian Russell Brand in a YouTube video.
Perched on stools in Brand's bare-brick kitchen at his home in east London, Miliband was peppered for 15 minutes with questions by Brand, who has urged Britons not to vote.
Meanwhile, the Daily Mail reported that 10 million people have not decided which way to vote in the May 7 election.
Its ComRes survey show the Conservatives and Labour tied on 35 per cent, with Ukip on 11 per cent, the Liberal Democrats on 7 and the Greens on 6.