Police in Great Britain are now using social media and are offering a reward for information about a 17-year-old girl from Latvia who has been missing for three months.

Alisa Dmitrijeva has not been seen since shortly after midnight Aug. 31 in King’s Lynn, which is about 100 miles (160 kilometers) northeast of London. Dmitrijeva, who was born in Latvia, was reported missing by a relative on Sept. 6, according to the Cambridgeshire Constabulary.

Police have created a Facebook advertisement targeting people living in Wisbech, Norfolk and Lincolnshire that will take visitors to a page with details on Dmitrijeva and the GBP 5,000 reward being offered for information that leads officers to finding her. The advertisement is in English, Latvian and Lithuanian.

“We know Alisa used social media so this advert will target people who may have information about her whereabouts,” Detective Chief Inspector Melanie Dales said in a Dec. 5 press release. “By translating the advert we hope to reach members of the community who know Alisa but may not have seen the appeals in traditional media.”

Police say they are becoming increasingly concerned for Dmitrijeva’s safety.

Dmitrijeva is described as 5 feet, 6 inches tall (1.67 meters), with collar length dark brown hair with blonde highlights. However, her hair may now be darker with a fringe.

Persons with information about Dmitrijeva’s whereabouts may telephone Cambridgeshire police at +44 0345 456 456 4 or, anonymously in the United Kingdom, through Crimestoppers on 0800 555 111.