LABOUR and the Tories were accused of being "grossly irresponsible" after failing to produce an administration plan for Kirklees Council after allegedly ousting the Cabinet.
Liberal Democrat leader Clr Kath Pinnock lashed out as a crisis continued to grip town hall corridors.
Her Cabinet quit on Wednesday after she lost a vote of no-confidence over her handling of the merger between Huddersfield and Dewsbury police
Clr Pinnock said: "Despite having plotted for the Lib-Dem/Green Cabinet to be ousted, it is now becoming clear that they (Labour and the Tories) made no plans for their replacement administration.
"This is gross irresponsibility on their part.
"They must take immediate action by forming a joint administration that would therefore represent a majority on the council."
Labour has said it would not link up with the Tories in a joint administration.
Clr Pinnock pledged her group would do everything it could to help a smooth transition for a new administration.
The Lib-Dems have 24 seats on the hung council, Tories 22 and Labour 18. The Greens have three, the British National Party one and there is one independent.