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It was the third attack on them during their stay on the island.
Police have revealed that five suspects were detained on Thursday and in the early hours of this morning in the capital Stone Town, where Kirstie Trup and Katie Gee were attacked, a senior officer told The Telegraph.
And a £4,000 reward is now being offered by Zanzibar police for information leading to the capture of attackers, according to the BBC.
Police have also issued a warrant for the arrest of Islamist preacher Sheikh Issa Ponda Issa, amid suggestions his teaching could have inspired the acid attacks.
Friends suggested they could have been targeted because they are Jewish, and local police said they wanted to speak to a radical Islamic preacher who could have inspired the attack.
Arriving in a black Audi at the air base this morning Katie's concerned mum Nicky opened spoke of the the families' ordeal.
Speaking as they were about to drive into the base, she said: 'I am worried sick. It has been a terrible ordeal for the families. I am just glad she is home. I want to get inside and see her.
'We spoke this morning and she said she was ok. I don't know what's going on at all.
'I can't say anymore because we have to get in to see them both.'
Two crews from St John's Ambulance arrived at the Middlesex military base, which also handles private flights, at around 10am this morning.
A paramedic, who wouldn't give his name, confirmed the crews had come to pick up the teens.
He said: 'We are here to pick up the two girls.'
He refused to say if they were going home or straight to hospital.
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