New Delhi/Haridwar: Breaking his silence on the police action at Ramdev’s protest congregation, Prime Minister Manmohan Singh on Monday said it was “unfortunate” but unavoidable even as the political battle on the issue heated up with the BJP knocking at the President’s door demanding a special session of Parliament to discuss black money. In his first comments on the issue, the Prime Minister Singh said, “It is unfortunate that operation had to be conducted but quite honestly, there was no alternative.” Meanwhile, in Haridwar, Ramdev resumed his fast vowing to continue his ‘satyagraha’ till Government accepts his demands on curbing corruption and black money.