AFP news agency reports a video message has emerged featuring a suicide bomber who attacked the UN headquarters in Nigeria last month.
The Boko Haram sect said it carried out the attack on 26 August in which 23 people were killed. More than 80 others were wounded.
The BBC reports the bomber drove through two security barriers at the headquarters in Abuja and into the reception area before detonating the explosives.
AFP said it had obtained two videos which included 25 minutes of speeches by the bomber.
AFP says that during much of his time on the video, the man held an AK-47. Two gas cannisters were on the floor at his feet and he was wearing what looked to be a suicide vest.
Boko Haram said he was Mohammed Abul Barra, 27, from the north-eastern city of Maiduguri.
The group is fighting for the establishment of Sharia law in Nigeria. It has been carrying out a campaign of killings for two years.
Loosely translated from the Hausa language, Boko Haram means Western education is forbidden.