Police are urgently appealing for the public’s help to identify the man in these photographs, who detectives want to speak to following the murder of nine-year-old Lilia Valutyte.

Two people who were arrested earlier this week have now been released with no further action.

Lilia Valutyte, who was part of Boston’s Lithuanian community, was found stabbed in a street in the town on Thursday.

Lilia who is a Lithuanian national was tragically found dead at about 6.20pm on Fountain Lane in Boston.

Police have made moves to reassure the public that this is an isolated incident.

Chief Superintendent Martyn Parker said: “Our officers have been working round the clock on this investigation, and the public’s help may prove crucial.

“These are very clear images of a man we want to speak to, so I’d urge anyone with information to get in touch with us. If you see him, do not approach him but immediately call 999.

“This is a particularly tragic case and I’d like to reassure the public that we have a huge amount of resources dedicated to the investigation.

“We continue to provide support to the family of Lilia, as they grieve following this unimaginable loss.”

• If you see this man, do not approach him but call 999 quoting Incident 419 of 28 July.

• If you have any information relating to our investigation, including if you think you know the identity of this man, call 101 quoting Incident 419 of 28 July.

Lilia’s parents are being supported by specially trained officers.