LONDON, Sha'ban 20, 1436, Jun 7, 2015, SPA -- A British warship in the Mediterranean launched a mission to rescue at least 500 migrants on Sunday, Reuters quoted the Ministry of Defence as saying in a statement. The MoD said a helicopter had identified four migrant vessels in distress. "HMS Bulwark has now commenced rescue operations to recover those in the vessels," the statement said. --SPA 11:30 LOCAL TIME 08:30 GMT www.spa.gov.sa/w