Singapore, July 19 (Reporter) Singapore has dispatched a navy ship and an air force helicopter to rescue two tankers on fire within its Maritime Search and Rescue Region, said the Maritime and Port Authority (MPA) Friday. MPA was alerted to a fire onboard a Singapore-flagged tanker and a Sao Tome and Principe-flagged tanker this morning, which were 55 km northeast of Pedra Branca. MPA has requested passing vessels to assist in the search and rescue of the crew...////...