A case was registered against four accused, arrested for the alleged rape and murder of a woman veterinarian in the outskirts of Hyderabad last week and killed in an encounter, for 'attacking' the police personnel.

A case under IPC sections 307 (attempt to murder), 176 (omission to give notice or information to public servant by person legally bound to give it) and relevant sections of the Indian Arms Act were registered against the accused.

Based on a complaint filed by the in-charge of police team that accompanied the four accused, the FIR was booked on Friday, a senior police official said.

Meanwhile, the National Human Rights Commission team is scheduled to visit the place on Saturday where the encounter took place.

All the four arrested accused in the rape and murder of the 26-year-old woman veterinarian were killed in 'retaliatory' firing by police at Chattanpalli, almost 50 km away from Hyderabad, on Friday morning, when they were taken to the scene of crime to recover the victim's phone, and others pertaining to the case.

The Cyberabad Police said its personnel resorted to "retaliatory" firing after two of the accused, Areef and Chennakesavulu opened fire at them by snatching their weapons besides attacking the latter with stones and sticks, resulting in injuries to two policemen.

“They kept firing. They continued to fire and attack despite us asking them to surrender,”Cyberabad commissioner VC Sajjanar said. In the incident, two police officers named Arvind Goud and Venkateshwarulu were seriously injured, including on their heads, according to the police. While briefing the nature of injuries that cops received, he said, “There are no bullet wounds on the police officers.”

The post-mortem of four accused was done in the Government District Hospital at Mahabubnagar district and it was video-graphed.

The four men, all lorry workers, aged between 20 and 26, were arrested on November 29 for allegedly raping and killing the woman by smothering her and later burning her body.