TAIPEI—Survivors of the plane that crashed Wednesday in a Taipei river recounted their experiences to relatives, and families of the dead mourned Thursday as recovery efforts at the site continued.

The cause of the crash of TransAsia Airways Corp. Flight 235, which carried 58 people, remains undetermined. Taiwan’s Aviation Safety Council said data from the plane’s recorder are being analyzed, and an initial assessment is expected to be released in the next two days.

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