(Reuters) - Ukraine will try to evacuate trapped civilians through 11 humanitarian corridors on Wednesday but people trying to leave the besieged city of Mariupol will have to use their own vehicles, Deputy Prime Minister Iryna Vereshchuk said.

       Efforts to get convoys of buses into the southern port city to evacuate tens of thousands of residents who are trapped there have repeatedly failed since Russian forces encircled Mariupol.

       (Reporting by Natalia Zinets, Editing by Timothy Heritage)