DETECTIVES searching for missing Hanwell schoolgirl Alice Gross will appear on Crimewatch tonight (Tuesday) to appeal for the public's help.

The programme will be broadcast on BBC1 at 10.40pm.

Det Chief Insp Andy Chalmers will be live in the studio, using CCTV images to show Alice’s last known movements on Thursday, August 28, between 1pm, when she left home, and 4.26pm when she walked beside the Grand Union Canal, back towards Hanwell.

Police have no confirmed sightings of Alice after that time.. Alice, 14, a pupil at Brentside Highh School, was wearing dark blue jeans,a grey top, and tartan framed glasses when she left home.

She was carrying a dark rucksack, and wearing denim blue ‘Vans’ shoes. They were in her rucksack when it was found by police on September 2.

Det Chief Insp Chalmers said: “Over two weeks ago now, Alice left home, just as normal, and went for a walk. She has not been seen since.

“The response so far from the public has been great, but as yet we have no confirmed sightings of Alice after 4.30hr that day.

“I am really keen to trace Alice’s phone, which I know has not been used since late afternoon on the day she was last seen.

“It is a white iPhone 4S, with distinctive cracked rear case that Alice had decorated with marker pen. If you saw, or currently have Alice’s phone please get in touch.”

Part of the investigation has identified another missing person that police want to trace.

Arnis Zalkains, 41, was last seen at home in Ealing on the evening of Wednesday, September 3.

It's believed he left early the next morning to travel to work. He would normally meet a friend at 8am so they could cycle to work together, but Arnis failed to turn up.

His normal route would take him along the Grand Union Canal and he rides a red Trek mountain bike.

He is a Latvian national, living with his partner and child. A builder, he was due to work in Isleworth on the day he disappeared.

A man of 25, who was arrested on suspicion of murder but subsequently released on police bail, has now been released.