Image caption Leanne Wood told BBC Sunday Politics Wales Plaid Cymru would not offer Labour 'unconditional support'

Plaid Cymru might withhold support from a minority Labour government, Leanne Wood has said.

Plaid says it will work with Labour if it does not get an outright majority in the general election, but Ms Wood said that did not mean unconditional support.

Labour said the election was a straight choice between it and the Conservatives.

The Tories warned about a "coalition of chaos" between Labour and nationalists.

Ms Wood has ruled out working with the Tories and has offered to help Labour keep David Cameron out of Downing Street.

'Irresponsible'

But when asked on BBC Sunday Politics Wales whether Plaid could vote against the programme of a minority Labour government in some circumstances, she said: "We may well do that."

She added: "Our aim as Plaid Cymru is to win the best possible deal for Wales and I think it's fairly irresponsible of the leader of the opposition to leave the door open for another Conservative government by refusing to contemplate doing any sort of deal with progressives."

Labour and Plaid are locked in battles for a handful of Welsh seats, including Ynys Mon and Arfon in north Wales.

Image caption Liberal Democrats leader Kirsty Williams said she had stood up for Wales in her party

Next week Ms Wood said her party would set out plans to turn north Wales into an economic "powerhouse".

Labour candidate Alun Pugh said: "This election has always been a straightforward choice between a Labour government that would work with the Welsh Labour government to deliver for our communities and a Tory government that has never been a friend of Wales.

"Now we know that Plaid will line up with the Tories to vote down a Labour government if they get the chance."

'More spending'

A Welsh Tory spokesman said: "As we saw on Thursday night, whatever Miliband says, the coalition of chaos is already forming between nationalists who want to break up the United Kingdom and Labour's economic chaos of more spending, more debt and higher taxes."

Meanwhile, Welsh Lib Dem leader Kirsty Williams said she had stood up for Wales within her party, successfully arguing against the introduction of regional pay deals in the public sector - something that critics feared would drive down wages in Wales.

She told Sunday Politics: "We would have seen Welsh public sector workers paid less for doing the same job as their colleagues in parts of England simply for being Welsh. We said to Nick Clegg you cannot allow that to happen and he stopped it."