Union Public Service Commission (UPSC) civil services aspirants, protesting against the Civil Services Aptitude Test (CSAT), on Wednesday allegedly torched a police check post in north Delhi's Nehru Vihar and vandalised two buses in Mukherjee Nagar, police said.
The protesters have been demanding the removal of CSAT which they say is biased against those from rural, regional language and humanities background.
The agitation intensified after the UPSC issued admit cards for the preliminary examination on August 24.
The protest began around 7.30pm in the Mukherjee Nagar area and the protesters soon moved to Nehru Vihar and blocked traffic, police sources said.
As a police team reached the spot to persuade the protesters to disperse and not block the traffic, heated arguments reportedly led to a scuffle.
At around 9pm, the crowd allegedly pelted stones on the policemen. In order to control the situation, the police led a lathi charge in which a few of them were injured. The condition of one of them is reported to be serious.
A fire department official said two fire tenders were sent to the spot to control the fire.
A case of rioting, disturbing peace and damaging public property has been registered. More than a dozen protesters have been detained and kept in custody at different police stations in north Delhi.
The three-member committee looking into the CSAT issue has sought one more week to submit its report, the government had told Rajya Sabha earlier on Wednesday.
The government declined to give a time frame to resolve the matter and said the issue will be resolved "as soon as possible" keeping in mind the sentiments of candidates.
A similar violent protest was reported from north Delhi last Thursday when the UPSC aspirants had torched a Himachal Pradesh roadways bus, a police van and a motorcycle following their clash with the police.