Rapid Action Battalion (Rab) on Wednesday detained the prime accused in Savar college teacher Utpal Kumar Sarker murder case from Gazipur district.

The arrestee is a class IX student of Haji Yunus Ali School and College at Ashulia of Dhaka’s Savar upazila college.

Read: College teacher murder: Prime accused’s father arrested from Kushtia

Based on secret information, an operational team of the Rab-1 conducted a drive in Sreepur of Gazipur in the evening and detained the teenager around 7:00 pm, said ASP (media) Imran Khan of Rab headquarters.

Earlier, Ashulia thana police arrested the 9th grader’s father Uzzal Hossain , another accused of the case from Kushtia, four days after the teacher was beaten to death in broad daylight in Savar .

Uzzal was hiding with his family since the murder.

Although Uzzal was arrested his other family members managed to flee during a police drive.

Police said they recovered the cricket stump that was used in the killing.

According to Md Kamruzzaman, Officer In-charge (OC) of Ashulia police station, based on secret information Investigation Officer (IO) of the case Sub Inspector (SI) Emdad Hossain arrested Uzzal from Kushtia’s Kumarkhali upazila.

Police sent Uzzal to a court in Dhaka seeking a 10-day remand.

Students and teachers of the college alleged that the student killed Utpal, head of the disciplinary committee of the college, in a pre-planned way.

Read: College teacher ‘beaten by students with cricket stump’ dies in Savar

“Utpal sir had caught the student (prime accused) with a girl inside a classroom and informed the family of the girl about the matter, which had created anger in him. That’s the reason why the student beat up Utpal sir to death on the sports day,” said a student of the college.

According to the college authorities, no CCTV footage of the crime was found as the cameras recorded nothing at that moment due to power outage.

The college authorities suspect that the boy had disconnected the power supply before killing Utpal.

Utpal Sarker, 35, son of Ajit Sarker of Engeldani village under Sirajganj’s Ullapara police station, had been serving as a teacher of Haji Yunus Ali School and College for almost ten years.