In an official release, the UPPSC said results of "combined civil service/upper subordinate examinations (Mains) declared on July 04, 2013" stood cancelled and "revised results" would be declared "at the earliest".
The Commission said that the decision was taken at a meeting held yesterday.
Last night, sources in the UPPSC had disclosed that the controversial reservation policy whereby caste-based quotas were introduced at the preliminary stages itself was being rolled back.
Moreover, on July 22, the Allahabad High Court had reserved its judgement on a petition challenging the new reservation system while restraining the UPPSC from conducting interviews "until the delivery of judgement".
The court had also questioned the "haste" of the Commission in bringing into effect the controversial amendment in reservation policy which was reportedly passed through voice-vote on the very day it was introduced.
The agitators raised slogans accusing the ruling party of "betrayal" and fled the spot upon the arrival of police party.
Heavy deployment of forces has been made at Yadav's Allahpur residence and efforts were on to nab the culprits, police said.
Meanwhile, 22 anti-reservation student leaders who were arrested on July 22 following a clash with police during agitations are likely to be released later in the day.
They were granted bail last night after the police agreed to withdraw charges under sections relating to attempt to murder and rioting with weapons likely to cause death.
