A meeting of top Opposition leaders on Wednesday night decided to unitedly fight the Bharatiya Janata Party-led National Democratic Alliance government at the Centre.

"We have decided in principle to fight BJP till the end," Samajwadi Party chief Mulayam Singh Yadav told reporters after the dinner meeting hosted by Communist Party of India-Marxist leader Somnath Chatterjee.

The meeting was attended among others by Congress president Sonia Gandhi, CPI-M veterans Jyoti Basu and Harkishan Singh Surjeet and former prime minister H D Deve Gowda.

Speaking to reporters after the meeting, former West Bengal chief minister Jyoti Basu indicated that the Left would go the extra mile to help the Congress in the coming assembly elections in five states.

The NCP was conspicuous by its absence at the meeting.

CPI leader A B Bardhan said there would be "no front or alliance but we will fight BJP together."