Five men were arrested in Zanzibar and are being questioned by police about the acid attack that left two 18-year-old British volunteers injured Wednesday night. Apparently, Katie Gee and Kirstie Trup (pictured) were not the first victims of such a vicious and seemingly random attack on the East African Island. Members of Uamsho, a group that wants Zanzibar to become a country independent from mainland Tanzania and run under strict Muslim law, have carried out acid attacks and shootings against Muslim and Catholic leaders in the last year. Religious leaders on the island believe the men who threw acid at the girls on Wednesday could be part of Uamsho. The five suspects will be interrogated. Meanwhile, the two girls are on their way from Tanzania back to the U.K. on a medical evacuation flight.