The 2G spectrum case has hurried the pace of the developments in the capital. In a significant development Finance Minister Pranab Mukherjee has written a letter to Prime Minister Manmohan Singh giving details of fast emerging developments over 2G issue. 

The letter has been written in the backdrop of the allegations and counter allegation and the blame game within the party and outside over the issuer of controversial Finance Ministry note.  

As Mukherjee, who had met the Prime Minister in New York on Sunday, wrote the letter, Chidambaram met Singh on his return from the US today.

Mukherjee, who returned to the capital from Kolkata late in the night, told reporters that "the correspondence between the Prime Minister and Ministers, I consider, are confidential".

The letter is understood to have detailed the various meetings held on the subject of allocation of 2G spectrum, the correspondence between various ministries and the events leading to the decision.

However, sources said Chidambaram was present at a lunch hosted by Singh for former British Prime Minister Tony Blair in which a number of others were present. There was no private meeting between the two, they said.

Mukherjee was unlikely to meet the Prime Minister, who will go to Sikkim tomorrow for a survey of the earthquake-affected areas. The meeting may take place on Friday before Mukherjee leaves for Kolkata.

He will be away from Delhi from October 1 to 6 during which period he would be in his home town for the Durga puja festivities.