Police have registered a murder case in connection with the killing of Rohingya leader Mohib Ullah at Ukhiya camp in Cox's Bazaar on Wednesday night.

The FIR for murder was filed against unknown persons at the Ukhiya police station on Thursday night on a complaint from Mohib Ullah’s brother Habib Ullah, said officer-in-charge Sanjur Morshed.

Additional Slsuperintendent of police (Ukhiya-Teknaf circle) Shakil Ahmed said that the case "is being investigated with due importance".

Unknown assailants gunned down Mohib on Wednesday night. He was first rushed to a local medical facility and later shifted to Cox's Bazar Sadar Hospital, where doctors declared him dead on arrival.

He was buried in Lambashia camp-1 in Ukhiya upazila on Thursday afternoon after his namaz-e-janaza, which was attended by a large number of Rohingya refugees from camps in Ukhiya and Teknaf upazilas.

Formerly a teacher in Myanmar, Mohib Ullah was popularly known as Master Mohib Ullah in the Rohingya refugee camps.

14-Armed Police Battalion (APBn) commander Md Naimul Haque said APBn troops have been deployed at the camp and "the situation is currently under control".

He suspects the killing was the result of an internal feud within the Arakan Rohingya Society for Peace and Human Rights (ARSPH) at Kutupalong camp. Mohib was the head of the society.