POLICE investigating the disappearance of schoolgirl Alice Gross are reviewing material from 300 CCTV cameras covering a six-mile radius.
The 14-year-old has been missing since August 28, when she was filmed on CCTV walking along the Grand Union Canal in London. Scotland Yard said 30 detectives were viewing the footage in the "ever-expanding search".
Detectives are continuing to search for convicted murderer Arnis Zalkalns, named as the main suspect in the case.
Search teams are also scouring parts of a park near where the missing teenager was last seen. Investigators announced they had identified an "area of interest" in Elthorne Park in west London, which runs beside the towpath where Alice was walking before she vanished.
The latest development in the increasingly desperate hunt for the teenager came after her parents and police renewed appeals for information, four weeks since she was last seen. Her mother, Rosalind Hodgkiss, said: "Every morning as Alice's disappearance grows longer and longer brings new agony, new anguish."
Investigators staged a reconstruction of Alice doing a "power walk" on the towpath next to the Grand Union Canal as it passes under Trumpers Way. She was caught on CCTV there at 4.26pm on August 28 and has not been seen since.
Zalkalns was filmed cycling the same route behind the teenager. Zalkalns, 41, went missing on September 3, after the murder squad took over the hunt for the teenager, and this was reported to police two days later on September 5.
He served seven years in prison after he was convicted of bludgeoning and stabbing his wife Rudite Zalkalns to death in his native country.
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