Shadow business secretary Chuka Umunna has called for Labour to unite behind the new party leader in an apparent offer of reconciliation from the party's modernising wing to leadership favourite Jeremy Corbyn.
He also welcomed a surge in party membership and support in the run up to the leadership contest saying that it was important not to "dismiss out of hand" criticism of New Labour.
Andy Burnham has warned against flirting with the idea of a British exit from the European Union and said the Labour party under his leadership would be "proudly pro-European."
Burham insisted that a British exit would put jobs and the economy at risk, and said it was time to "nail our colours firmly to the mast".
Speaking at a campaign event in Swansea, Mr Burnham said:
"To flirt with exit from the EU is to put people's jobs, communities and future prosperity at risk. This is no time to cut ourselves off from our largest market. It is time to nail our colours firmly to the mast.
"Any Labour Party I lead will be proudly pro-European and will instantly set about the task of securing our membership of the EU."
The warning comes after Mr Corbyn suggested that Labour could hold a special conference before deciding its response to any EU reform package proposed by David Cameron.
Labour's Chuka Umunna urged his party to unite around its new leader in an apparent offer of reconciliation to left-winger Jeremy Corbyn.
Some 3,000 infiltrators have been discovered and barred from voting in the Labour leadership contest, a party source has told ITV News.
The Labour leadership candidates will meet with acting leader Harriet Harman after accusations the vote was infiltrated by opponents.