Nineteen alleged pirates — including three Greeks and an American — were arrested over the weekend in the Gulf of Guinea and suspected of stealing oil and illegal possession of firearms, according to local media.

Lagos-based The Nation reports nine of the men were taken into custody during a joint operation between the Nigerian and US navies Sunday night.

The men were reportedly aboard a Nigerian Maritime Administration and Safety Agency ship called the Sea Angels 3 with four rifles and thousands of rounds of ammunition.