Police divers have been seen searching a pond as part of the investigation into the disappearance of 19-year-old student Richard Okorogheye.
Mr Okorogheye has not been seen by his family since 22 March when he left their home in the Ladbroke Grove area of west London.
The 19-year-old, who has sickle cell disease, took a taxi to Loughton, Essex. He was reported missing two days later.
He was last seen in CCTV footage recorded near Epping Forest the day after his disappearance.
The Metropolitan Police said the search of the woodland continued for a fourth day on Sunday but nothing of relevance to the investigation has been found.
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