Search Continues For Missing Teenager Alice Gross

LONDON, ENGLAND - SEPTEMBER 23: Yellow ribbons are tied to a tree in an area close to where schoolgirl Alice Gross was last seen on September 23, 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 focussed on a key suspect, Arnis Zalkalns, a Latvian builder, who was seen in the vicinity of Alice's last sighting. (Photo by Rob Stothard/Getty Images)