Police are appealing for information as three people, including a woman and her husband, are missing.
Insun Choi, 67, is Korean and missing from Merton along with her husband, Il Park, 72.
Mario Ducally, 14, is missing from Bedfordshire but has links to Mitcham and is believed to be in the borough.
Anyone who may have seen the missing people are asked to call 101.
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