Another protester, Col Pushpendra Singh, was taken to hospital yesterday after his medical report showed increased levels of ketone, which is toxic for the body.
Meanwhile, two more veterans, Maj (retd) Tyar Chand and Nayak (retd) Uday Singh, joined the fast-unto-death protest, which entered its ninth day today, at Jantar Mantar.
The OROP row escalated yesterday when Pushpendra Singh, fasting since last Tuesday, was shifted to the army hospital after his medical report showed increased ketone levels.
Ex-servicemen have been holding protests for over two months seeking the implementation of OROP and are hoping to soon meet Prime Minister Narendra Modi.
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Four former service chiefs recently wrote to President Pranab Mukherjee, the supreme commander of the armed forces, asking him to "urgently intervene" in the OROP row.
Ten former Service chiefs, too, have written a joint letter to Modi seeking early implementation of OROP.
Close to 22 lakh ex-servicemen and over six lakh war widows stand to be the immediate beneficiaries of the scheme, which envisages a uniform pension for defence personnel who retire in the same rank with the same length of service, irrespective of their date of retirement.