New Delhi (PTI): Ahead of the meeting of UPA-Left Committee on nuclear issue on Tuesday, the CPI(M) on Monday made it clear that it would not allow the government to proceed on the Indo-US atomic deal.

"The 123 agreement is anchored in Hyde Act and we don't want the government to proceed on it with such provisions," CPI(M) politburo member Sitaram Yechury told reporters here.

At tomorrow's meeting, he said, the Left parties will see "what kind of discussions the government has had with IAEA".

As part of implementation of the Indo-US nuclear deal, India concluded negotiations with IAEA on the Safeguards Agreement in February but it could not be signed because of stiff opposition from the Left parties.

The Left parties, which provide crucial outside support to the government, had stressed that the agreement should be signed only after they examine the pact and give a go-ahead.

Tomorrow's meeting has been called to deliberate on whether India should go ahead with signing the agreement.

"We will consider what the government will report to us on its talks with the IAEA. On that basis, we will take the issue forward," a senior Left leader had said earlier when asked about the stand that the four supporting parties are going to adopt at the upcoming meeting.

After the last round of UPA-Left meeting on March 17, the Left parties and the government have been exchanging notes on related issues, but no details are available.

Though Left leaders have refused to divulge details about these exchanges, informed sources said these related to several political and technical matters like assurance on uninterrupted fuel supplies.