ABOUT 80 PEOPLE are taking part in today’s volunteer search for missing woman Monica Riordan who has not been seen since 20 December.

Search and rescue teams, as well as members of the Garda Diving Unit, are combing the River Liffey looking for signs of the 39-year-old.

They are being assisted by teams of colleagues and friends of the Riordan family and members of the Civil Defence.

Riordan was last seen in the Pearse Street/Macken Street area of Dublin’s city centre at about 5pm on 20 December.

She had walked along Macken Street from under the railway bridge towards the junction with Pearse Street and appeared to be disoriented and confused at the time.

Riordan is described as being of average height, slim build and with shoulder-length blonde hair. When last seen, she was wearing a hooded long grey coat, dark jeans and grey or white trainers.

Her friends and colleagues have set up a Facebook page to raise awareness about the disappearance and have been distributing posters in a renewed appeal for information.

Gardaí are appealing to anyone who was in the Macken Street, Pearse Street or Grand Canal Street area between 4.30pm and 6pm on Tuesday to contact Pearse Street Garda Station on 01 666 9000, the Garda Confidential Line 1800 666 111, or any garda station.