The three torture victims were identified as Sumon, a student of St Xaviers High School, Rumi, a student of Khulna Alia Madrasa, and Masum Imam, an HSC candidate from Khulna Shahid Suhrawardy College -- all residents of Basupara in Sonadanga of Khulna City.

Sumon and Rumi sat for the examinations with severe injuries on Thursday.

Some Rab members entered their house scaling the boundary wall on Wednesday midnight, Shumon's father freedom fighter Mostafa Shaikh said, adding that they searched all the rooms of the house before taking Shumon to Rab headquarters.

"When I wanted to know what the offence of my son was, a Rab man threatened me," Mostafa said.

"Sumon was returned to me at 3:00am on Thursday with multiple injuries to several parts of his body. His legs were swollen. Again on Thursday afternoon Rab took Sumon to Khalishpur headquarters. He was set free at 7:30pm," he added.

Madrasa student Rumi also got similar treatment from the elite force, sources said.

The two boys are suffering severe pain and still to recover from the mental shock due to the torture.

They have been threatened with dire consequences for talking to media men, Mostafa Shaikh said.

Rab men tortured HSC candidate Masum Imam until he fainted at the Khulna Rab headquarters on Wednesday midnight, his mother Monowara Begum said, adding that Rab men gave Masum electric shock on false allegation of keeping illegal arms.

He was sent back to his father at 11:30 pm on Thursday, Monowara said.

Rab-6 Director Col Shamsul Huda Shams said Sumon, Rumi and Masum were caught following information that they were in possession of illegal arms and the three admitted to their criminal activities.

Col Shams, however, denied torturing them physically.

The matter has been brought to the notice of Rab Director General Abdul Aziz Sarker, sources said.