The Foreign Office is investigating reports two Britons were shot during a robbery while on holiday in Barbados.
The pair, believed to be a man in his 70s and a woman in her 50s, were hit in Bridgetown during a stopover as part of a Caribbean cruise.
P&O Cruises confirmed two of its passengers from the Adonia, which left Southampton on 8 January, were taken to hospital after an "incident".
Local authorities are investigating, the cruise company added.
The ship's staff and medical team are also providing support.
"We are aware of an incident involving two British tourists in Bridgetown, Barbados," said a spokesman for the Foreign Office.
"We are providing consular assistance."
Adonia, which is currently on an 85-night world cruise, is due to arrive back in Southampton on 3 April.