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The police are appealing for information on the whereabouts of 63-year-old Gwee Keng Yong.
He was last seen at Bishan MRT Station on July 9, at around 5pm.
Anyone with information is requested to call the Police Hotline at 1800-255-0000 or submit information online at www.police.gov.sg/iwitness.
All information will be kept strictly confidential.