Police in Northern Ireland are digging for the body of a teenager believed to have been murdered more than 20 years ago.

The search for the remains of Caroline Graham is being concentrated on waste ground in the Carleton Street area of Portadown, Co Armagh.

The 19-year-old, who was originally from Newry, disappeared from the home she was sharing with her boyfriend in April 1989.

Police had previously searched the site, but PSNI Detective Inspector Gary Crawford said advances in technology could help locate the body.

He said: "This stage of the operation will involve clearing away shrubbery and undergrowth so that we can insert probes into the ground to determine the possible existence of human remains."

He said their search advisers will be working with other specialists to determine as definitively as possible whether Ms Graham's remains are buried at the location.

Inspector Crawford said that Ms Graham's parents, sister and brother are being kept informed of their plans.