LONDON, ENGLAND - SEPTEMBER 25: Police display a pair of spectacles identical to the those worn by missing schoolgirl Alice Gross, during a reconstruction of her last known movements before she went missing, on September 25, 2014 in London, England. The hunt for Alice Gross from Hanwell, who went missing on August 28, is now being described as the largest police search operation since the 7/7 bombings of 2005. The police inquiry is now focused on a key suspect, Arnis Zalkalns, a Latvian builder, who was seen in the vicinity of Alice's last sighting. (Photo by Peter Macdiarmid/Getty Images)

LONDON, ENGLAND - SEPTEMBER 25:  Police display a pair of spectacles identical to the those worn by missing schoolgirl Alice Gross, during a reconstruction of her last known movements before she went missing, on September 25, 2014 in London, England. The hunt for Alice Gross from Hanwell, who went missing on August 28, is now being described as the largest police search operation since the 7/7 bombings of 2005. The police inquiry is now focused on a key suspect, Arnis Zalkalns, a Latvian builder, who was seen in the vicinity of Alice's last sighting.  (Photo by Peter Macdiarmid/Getty Images)