BBC News - British women attacked with acid in Zanzibar
Katie Gee and Kirstie Trup, both 18 and from London, were working as volunteer teachers on the island.
Their mothers, Nicky Gee and Rochelle Trup, said they expected them to return to the UK on Thursday night.
The Foreign Office said it was "concerned to hear of an attack on two British nationals" and was "providing consular assistance".
The women's mothers said in a statement: "Both families are extremely upset and distressed at this completely unprovoked attack on their lovely daughters who had only gone to Zanzibar with good intention. We understand that they will be flying home overnight.
"We appreciate all the interest and support we have received from the media but we would ask that we are left alone until we have been reunited with our daughters."
Nicky Gee told Sky News her daughter's whole face and body had been burned by acid in the attack.
Voluntary work
Police said two men on a moped threw the acid at the women, splashing their faces, chests and hands 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.
Two British women have had acid thrown in their faces in Zanzibar, police on the east African island say.
Their mothers, Nicky Gee and Rochelle Trup, said they expected them to return to the UK on Thursday night.
The Foreign Office said it was "concerned to hear of an attack on two British nationals" and was "providing consular assistance".
The women's mothers said in a statement: "Both families are extremely upset and distressed at this completely unprovoked attack on their lovely daughters who had only gone to Zanzibar with good intention. We understand that they will be flying home overnight.
"We appreciate all the interest and support we have received from the media but we would ask that we are left alone until we have been reunited with our daughters."
Nicky Gee told Sky News her daughter's whole face and body had been burned by acid in the attack.
Voluntary work
Family statement, read by friend Doug Morris: "We are extremely upset and distressed at this unprovoked attack"
