Foreign Minister Dr AK Abdul Momen on Saturday vowed to bring the killers of Mohib Ullah to justice soon, in his first remarks since the Rohingya leader's murder sparked global condemnation. Dr Momen said that a vested quarter killed  Mohib as he wanted to return to Myanmar, his home country. "The government will take stern action against those who were involved in the killing. Nobody will be spared," he said. On Thursday night, police registered a murder case in connection with the killing of Mohib Ullah at Ukhiya camp in Cox's Bazar on Wednesday night. The FIR for murder was filed against unknown persons at the Ukhiya police station on a complaint from Mohib Ullah’s brother Habib Ullah, officer-in-charge Sanjur Morshed had said. Read: Mohib's murder: FIR lodged, probe in full swing, say police Unknown assailants gunned down the 44-year-old 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. Also read: Mohib's killing, Rohingya repatriation: Bachelet for redoubling global pressure on Myanmar 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. Also read: Rohingya leader Mohibullah assassinated Formerly a teacher in Myanmar, the slain human rights activist was popularly known as Master Mohib Ullah among the Rohingya refugees. He was the head of Arakan Rohingya Society for Peace and Human Rights (ARSPH) at Kutupalong camp.