FBI started search immediately, but they could not find them. They could not find their bodies as well. All they found were a part of their raft, bags of Anglins, etc... FBI and Alcatraz authority decided that they were drowned and died. But government decided to close Alcatraz Prison about 1 year after this escape.
Picture uploaded here are above left "Frank Morris, John and Clarence Anglin (Left to Right), and their dolls" and "Original Federal Signboard showing what Alcatraz is".
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