Two British women have had acid thrown in their faces on the east African island of Zanzibar, reports AFP news agency.
A couple of men on a moped threw the acid at the women as they walked through the streets of Stone Town, the old part of the island’s capital Zanzibar City, which is a UNESCO world heritage site.
The 18-year olds, believed to be charity volunteers, have been flown to mainland Tanzania for treatment.
The Foreign Office said it was "aware of an incident" and was "providing consular assistance".
Deputy police commissioner Mkadam Khamis told AFP: "The motive for the attack on the volunteers aged 18 years, has not been established. Investigations are on until we apprehend the criminals."
The Foreign Office said: "On 7 August two British women were the victims of what appeared to be an acid attack in Stone Town, Zanzibar. FCO staff are providing consular assistance and are in touch with the Tanzanian authorities. British nationals are reminded to take care."
On its travel advice section, it says mugging, bag snatching and robbery have increased throughout the country and advises against walking alongside the road, carrying valuables or wearing expensive jewellery.
There has been a series of attacks in the archipelago, including an acid attack on a Muslim cleric in November, and the shooting dead of a Catholic priest in February.
