Police have found a knife during the search for missing teenager Alice Gross and the chief suspect in her disappearance, Arnis Zalkalns.

Teams of officers carrying out a finger-tip search of the River Brent in west London made the discovery on Monday afternoon (22 September 2014).

Scotland Yard said it was not possible to connect the blade with the 14-year-old's disappearance.

Alice has not been seen since late August, last spotted walking home along the Grand Union Canal in London.

Police are also looking for Arnis Zalkalns, a Latvian killer living in the capital city who went missing soon after Gross. Zalkalns killed his wife in 1998 and has been described as "potentially posing a risk to the public."

Both were caught on CCTV at the same spot of the canal a short time apart on the day Gross vanished.

Six hundred officers are taking part in the investigation to find Gross, the largest effort by the Metropolitan Police since the 7/7 terror bombings in 2005.

They are searching a nine mile area, including three miles of water. A £20,000 reward has been offered for news leading to Alice's discovery.