The Rapid Action Battalion late Tuesday night filed a case against the slain youth on charge of unauthorised possession of a revolver loaded with two bullets, which it claimed to have retrieved from the scene of Sumon's killing.

It also lodged another case against the unknown assailants for the murder at around the same time with Khilgaon police.

"Rab-3 Senior Warrant Officer Rahim Ullah filed the two cases at 6:00pm yesterday," Sub-Inspector Borhan Uddin, duty officer at Khilgaon Police Station, told The Daily Star over telephone at 7:00 yesterday evening. Borhan said Rab accused unknown assailants of the murder.

Another officer of the police station who acted as the duty officer Tuesday night, however, told The Daily Star at 8:30 on that night that no case was filed until then.

Sumon, acting joint convenor of ward No 25 unit of Awami Jubo League, the youth front of the main opposition Awami League (AL), was gunned down at Banasree Project in Rampura at 3:30 Tuesday morning.

Branding Sumon as a notorious criminal, Rab claimed he was killed in a "shootout" in Rampura, but witnesses and sources said the anticrime force arrested him in Goran at 9:00pm on Monday and killed him later in its custody.

There is no proof of the Jubo League leader's crime link and sources said Jubo League leader Sumon is not "Goailya Sumon", as Rab claimed. Three cases are pending against "Goailya Sumon" with Sabujbagh police.

Sumon's relatives, meanwhile, said they would file a case against the Rab men today.

Earlier at 9:00pm Tuesday, Sumon's uncle Suruj Ali received his body from Dhaka Medical College morgue on completion of autopsy. The body was later kept at Birdem Hospital mortuary.

The first namaj-e-janaza was held at Baganbari in Goran near Sumon's house after Johr prayers yesterday. The second janaza was held in front of AL headquarters on Bangabandhu Avenue at 4:00pm before he was buried at Azimpur Graveyard.

Activists of the AL and its front organisations tried to take out a procession from Bangabandhu Avenue office after Sumon's burial, but the police dispersed them.

They later held a protest rally there with Jubo League city unit President Mohiuddin Mohi in the chair. AL General Secretary Abdul Jalil, Organising Secretary Saber Hossain Chowdhury and Jubo League General Secretary Mirza Azam, MP, among others, addressed it.

Jubo League later announced a four-day programme to protest Sumon's murder.

Protest processions will be brought out and demonstrations staged in the districts on Saturday and in upazila headquarters the following day. On Monday, the youth wing will bring out a procession from its central office.