The family of missing Galway woman Bláthnaid Timothy are appealing to foreign taxi drivers to ask their colleagues if they were driving the taxi she was seen getting into during her last confirmed sighting.
Her brother Ronan Timothy said his family were surprised the taxi driver whose cab Bláthnaid was last seen getting into had not yet come forward some two weeks after she disappeared.
However, he said it was possible the taxi driver was foreign and may not read Irish newspapers or watch and listen to Irish television and radio and may simply be unaware of the search for his sister.
"We have done leaflet drops to taxi drivers in Dublin and even among those that aren't Irish we've found they are aware of the search for Bláthnaid," Mr Timothy said.
"But it is possible other drivers that aren't Irish don't have that awareness so we're continuing to target drivers with leaflet drops and we're also going to do an appeal through the newspaper Metro Eireann, which is read by a lot of non Irish people."
Ms Timothy (33) used her ATM card to withdraw €60 at the National Irish Bank on Sir John Rogerson's Quay on Dublin's south quays at 8pm on Tuesday, December 14th.
CCTV footage from the scene shows her getting into a taxi across the street, which may have been a black Mercedes.
Ms Timothy, a successful executive who had worked for Coca-Cola and KPMG, is from Glenamaddy, Co Galway but is living in Dublin, sharing a flat at Smith Hall on Camden Street.
When her family and friends had not heard from her for a number of days and efforts to contact her failed she was reported missing on December 17th.
While it was believed the taxi was black in colour, Mr Timothy told The Irish Times that gardai now believe the cab may have been a dark colour, possibly dark blue or dark green and possibly dated between 1992 and 1997.
He also said that while the cab his sister got into was captured on the CCTV footage driving westwards up the south quays, it was possible it turned right over the River Liffey and drove on to the north side, possibly towards Fairview.
"Really there is very little definite information so at the moment the gardai can't rule these facts in or out, they have to keep an open mind," Mr Timothy said.
Ms Timothy is described as being 167.6cm (5ft 6in) tall, of thin build and pale complexion, with medium length dark brown hair and blue eyes. She was wearing a three-quarter length black wool coat, grey jeans and a black and red scarf when last seen.
Anybody with information is asked to contact Harcourt Terrace Garda station on 01-6669500.
