Two boats filled with armed men boarded a Polish-owned cargo vessel on Friday, according to Reuters.
The ship was anchored 30 nautical miles off of the Nigerian coast, awaiting the arrival of a new crew.
The kidnappers, who remain unidentified, have not yet made any demands. In a press statement, Polish Foreign Minister Witold Waszczykowsk stated that the Polish Foreign Ministry is currently liaising with the Nigerian government.
The coast of Nigeria is considered by security experts to be among the most dangerous waters in the world. Pirates and other bandits often prowl the area for oil tankers.
According to Reuters, this is the first documented attack in Nigerian waters since February.
In light of this event, the Polish maritime authorities are in the process of reviewing their security measures.