Nigerian radical sect Boko Haram has purportedly threatened several domestic and international news organizations, including the Hausa service of Voice of America.

The threats are contained in an 18-minute video posted to YouTube on Tuesday.

The video shows a car bomb exploding in Abuja last Thursday outside an office of This Day, one of Nigeria's most prominent national papers.

Later, scrolling text notes that the group has complained about “bad press,” and an unnamed man, sitting next to a rifle, threatens nine other Nigerian papers and the Hausa service of VOA, which broadcasts to Nigeria.

He also threatens the Hausa service of Radio France International.

The authenticity of the video could not be immediately confirmed.

In a statement, VOA spokesman David Borgida said, “VOA has no comment but takes the safety of all its journalists very seriously.”

Boko Haram previously claimed responsibility for the blast outside This Day's Abuja office, which killed three people, and a separate blast near the paper's office in the city of Kaduna, which also killed four.

Human Rights Watch says the group has been responsible for more than 1,000 deaths over the past three years, mostly in the north.

The group says it is fighting to impose Islamic law in Nigeria and does not recognize the country's constitution.