AHEAD of the reconstruction today of Alice Gross's last-known movements on the day she disappeared, the police chief in charge of the hunt for her appealed directly to the public.

Det Supt Carl Mehta, said: "The support has been amazing, both from the local community and all the hundreds of people who have called in to give us information.

"We still need your help to find Alice and bring her home to her family.

"Today my appeal is simple. Alice was last seen on CCTV walking along the canal towpath, heading under Trumpers Way bridge towards Hanwell.

"Since 4.26pm on that Thursday, she has not been seen. Did you see Alice that afternoon? Have you seen her since? We need your help to find her.

"Just as Alice reached the bridge it started to rain heavily. Think back and try to remember if you were out and about in that area that afternoon. It was during the summer holidays and the canal is a really popular place locally.

"We know that Alice loved the rain, so she probably would have kept walking in it, rather than seek shelter.

"There are many paths and turn offs from that canal towpath. We don't know the route that Alice took, so please think back to that Thursday four weeks ago and call us if you can help."

Alice is white, 5ft 2 ins tall and of very slim build with shoulder-length, light brown hair.

"When she left home that day she was wearing dark blue jeans, a dark T-shirt, and tartan-framed glasses.

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

An update inter-active map that highlights key appeal points is now available to access on http:www.thinglink.com/scene/571616920088870912