Israeli forces commandeered approximately 40 boats, which were carrying aid and activists attempting to breach the blockade of Gaza.
All passengers are reported safe and healthy and are being taken to Israel, where they face deportation to their home countries.
The interception has triggered widespread international protests and condemnation, with Turkey calling it an 'act of terror' and Sinn Féin labelling it a 'kidnapping'.
The UK Foreign Office expressed concern and is in contact with Israeli authorities and the families of British nationals involved, expecting a safe resolution.