Two British women have been subjected to an acid attack by men on mopeds in Zanzibar, according to reports.
Sky News said the young women had acid thrown in their faces during the late-night attack on the east African island.
They are reportedly 18-year-old charity workers.
A spokeswoman for the Foreign Office said: "We are aware of an incident and are providing consular assistance."
She added that officials became aware of the incident last night.
Deputy police commissioner Mkadam Khamis told Sky News: "Police in Zanzibar have launched a manhunt, and we ask for public assistance in identifying the attackers."
Zanzibar is an archipelago of islands in the Indian Ocean around 22 miles off the coast of mainland Tanzania.