Police : The government will regulate the sale of acid , step up police patrols . Eyewitnesses say acid was splashed on the women 's faces , chests and arms . They were volunteering as teachers in schools , i - to - i Travel says . Their attackers were two men on a motorcycle , police say .
NEW : The government will regulate the sale of acid , step up police patrols . Eyewitnesses say acid was splashed on the women 's faces , chests and hands . They were volunteering as teachers in Zanzibar , i-to-i Travel says . Their attackers were two men on a motorcycle , police say .