Nigerian officials say they will report Iran to the U.N. Security Council if they find evidence that an illegal arms shipment allegedly originating in Iran broke international law and U.N. sanctions.
Nigerian Foreign Minister Odein Ajumogobia issued the threat Friday.
He met in Abuja late Thursday with Iranian Foreign Minister Manouchehr Mottaki to discuss the arms shipment.
Ajumogobia said Mottaki authorized Nigerian officials to interview one of two Iranians implicated in the arms shipment.
The cache of weapons was seized by Nigeria's secret service two weeks ago in Lagos and found to contain rockets, rifle rounds, grenades and other explosives.
Israeli officials have said the weapons were bound for the Hamas-controlled Gaza Strip. A Hamas leader in Gaza denied the weapons were headed to Gaza.
Nigeria has been on alert since a bombing near an October 1 Independence Day celebration killed 12 people.
A Nigerian militant group, the Movement for the Emancipation of the Niger Delta, claimed responsibility for the attack.
Some information for this report was provided by AP and Reuters.