Police in Cameroon have detained four navy officers and five civilians in connection with a robbery by pirates last month who were accused of storming a bank with grenades.
A police spokesman said Wednesday that the first arrests in the case were made April 11. The police spoke on condition of anonymity because of the sensitivity of the investigation ordered by President Paul Biya.
Police say that detained Cmdr. Nestor Ndecke had established contact with the group that staged the robbery. Sea raiders allegedly from Nigeria's turbulent Niger Delta region carted away $400,000 after shooting their way into Douala's pan-African Ecobank, killing seven people and using grenades to split open the safe on March 18.
Two gunmen were arrested after the attack. Cameroon's army said it killed 18 pirates suspected of the robbery.