New Delhi, Aug 15 (IANS): Prime Minister Narendra Modi on Saturday said his government has accepted "in principle" the One Rank One Pension scheme and that he expected a "positive outcome". However, the assurance left the ex-servicemen "very disappointed".

It was anticipated that he would announce the implementation of the scheme in his Independence Day speech, but Modi only repeated his government's stand.

The ex-servicemen declared August 15, 2015 a "Black Day" and also said those who have been on relay hunger strike since June 15, have now said they will not stop members willing to go on fast unto death.

"I am assuring again, it is not a person speaking, I am speaking on the behalf of 125 crore people, under the tri-colour, from the ramparts of Red Fort... In principle we have accepted One Rank One Pension. The phase of discussions is on," Modi said in his address to the nation.

"People of India sleep in peace because of the jawans. For the 125 crore people of Team India, the soldiers are national resource," Modi said from the ramparts of the Red Fort.

"Many governments came, OROP came in front of everyone... Everyone promised, but no solution was reached," he said.

But ex-servicemen protesting in the heart of the national capital on Saturday and shouted "shame, shame" after Modi did not announce the scheme's implementation.

"We had high hopes with this government. We are very disappointed," Col Anil Kaul (retd), spokesperson of the United Ex-Servicemen Front, told IANS.

"It is sad. Those who have been guarding the border for 68 years are being ill treated. Neither the prime minister not the president had a word to offer after what happened yesterday," he asked, referring to the police and civic employees' swooping on the protesting retired soldiers at the Jantar Mantar protest site on Friday.

The veterans were later allowed after an intervention from the home ministry.

On Saturday, as soon as they realised that Modi was not going to make any announcement, dozens of retired soldiers rose from their seats near the Jantar Mantar monument and started shouting slogans.

Many were furious and kept shouting "shame, shame". Others raised their fists in anger.

One retired officer said that Saturday was a "black Independence Day" for ex-servicemen and their "hearts were broken".

The spokesperson said that the agitation will now be scaled up.

"We will take it to Bihar and Punjab... and we will now gherao MPs and ministers who stood in the way of OROP," Kaul said. He said all veterans will wear black bands and put black flags on their vehicles.

"We will no more stop the veterans who want to go on fast unto death. We have declared Aug 15, 2015 as "Black Day"," Kaul said.

He added that currently at least 21 veterans, including three officers, were ready to go on fast unto death.

There are around 24 lakh retired servicemen in the country and around 6.5 lakh widows who will benefit from the implementation of OROP.