Gunmen have killed a state media employee in a northern Nigerian city, where Muslim fundamentalists have carried out a series of deadly attacks.

Authorities said Sunday that Zakariyya Isa, a cameraman with the state-run Nigerian Television Authority, died in Maiduguri after being shot the night before. He was attacked soon after leaving a mosque.

There has been no claim of responsibility for the shooting. However, authorities are blaming Boko Haram, which has claimed responsibility for a spate of bombings and ambushes in northern Nigeria, as well as the bombing of the U.N. headquarters in Abuja that killed 23 people.

Last month the group threatened to attack journalists who “misrepresent” it in their reports.

The motive for the shooting remains unclear. The National Union of Journalists says nothing in Isa's work should have made him a target for the militants.

Boko Haram, which means “western education is sinful” in the Hausa language, says it is fighting for an independent nation in northern Nigeria that would be ruled by Islamic law.