The crew of a Tidewater platform supply vessel (PSV) was reported safe on Thursday following a pirate attack off Nigeria.
EOS Risk Group said gunmen boarded the 4,700-dwt Saavedra Tide (built 2016) while it was en route to the Egina FPSO on Tuesday.
It added: "The likely modus operandi is kidnapping for rescue, but with the crew allegedly locked inside the citadel, the [pirates] may attempt to attack other vessels nearby until a successful hijacking is achieved."