Note: This is an excellent background article -- worth a read.
18 June 2011
Police Interim Report submitted to the Inspector General of Police Hafiz Ringim by the investigating Police team looking into the bomb blast of last Thursday, showed that the suicide bomber was not a Nigerian but possibly a Sudanese or a Somali national and that the bombs that exploded, twin bombs tied together, were foreign made explosives.
The suicide bomb attack which was also captured by CCTV cameras of the Federal Capital Police Command Operations Centre, also showed that there was eight minutes interval between when the Inspector General drove into the force headquarters and when the suicide bomber drove into force headquarters.
The implication is that the suicide bomber wanted the Inspector General of Police to be in his office before carrying out his mission which was to blow up force headquarters and kill as many police officers as possible including the IGP.