Police are hunting a convicted murderer over missing 14 year old Alice Gross who has now been missing for three weeks.

Police are urgently looking to trace Arnis Zalkalns aged 41-years old, he is a convicted murderer, he was convicted in 1998, he served seven years in prison in Lativa upon his release he London.

He came to the attention of the Metropolitan Police in 2009 following the indecent assault of a child, Police dropped the allegations as these could not be substantiated.

Zalkalns aged 41 a builder living in Ealing was last seen on Wednesday September 3rd, 2014. Police now know he was just 15 minuets behind Alice Gross on a footpath of her last known sighting on CCTV, She has not been seen since.

Zalkalns was on a cycle bike with Alice Gorss walking on foot, they may have seen each other.

Zalkaln left home early on Thursday, 4 September to travel to work. Arnis would normally meet a friend at approximately 0800hrs so that they could cycle to work together but Arnis failed to turn up on that morning. His normal route would take him along the Grand Union Canal and he rides a red Trek Mountain Bike.

Detective Superintendent Carl Mehta, from the Homicide and Major Crime Command, said:

“I want the public’s help. On Thursday 28 August Arnis Zalkalns left work, in Isleworth, at about 3.30pm on his bike. Did you see him that afternoon? Either on his own, or with a teenage girl?

“I also need to hear from anyone who knew Arnis whom we have not yet spoken to. His family and work colleagues have stated he was behaving normally in both the days before and after Alice’s disappearance. They are deeply concerned about his disappearance.

“Arnis has not been seen since Wednesday 3 September. I want anyone who may have seen him after that date, or who may have helped him by giving him money or somewhere to stay, to call and speak to us. It is really important that we trace Arnis and speak to him about Alice’s disappearance.

“Three weeks ago today Alice left home as usual. She has not been seen since 4.26pm, when she walked along Trumpers Way. So far the public have given us great support, but there may still be people out there who were walking in the area Alice was on that Thursday who have not yet spoken to us. If you were and you saw anything that could help progress our investigation – please call.

“ Alice used social networking sites, Facebook, Twitter and Ask.fm. I’m asking anyone who may have been talking to Alice on these sites in the run up to the day she disappeared to speak to us.”

Police have now offered a £20,000 reward for any information that will assist detectives in locating Alice Gross.

Alice is white, 5 ft 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 and a grey top, 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 2 September.

Arnis Zalkalns is white, 5ft 10ins, stocky build with dark brown hair, that he normally wears tied in a pony tail. He normally cycles to work, and rides a red Trek Mountain Bike and a racing bike.

Anyone with any information is asked to contact the investigation team on 020 8358 0100, or call Crimestoppers anonymously on 0800 555 111.