Around 50 police officers are searching woodlands and River Ely in the search for missing rugby fan Ben Thompson.
34-year-old Ben, from Haverfordwest, was last seen by friends in Cardiff's Mill Lane on Saturday evening.
CCTV footage shows him crossing Leckwith Road into Lawrenny Avenue at 7.17pm that evening, before walking down a lane at the end of Lawrenny Avenue towards wasteland.
"We have had a positive response following yesterday’s press appeal and wish to thank all those who have called us" says Chief Inspector Eddie Ough.
"The information they have provided has confirmed that we are searching the right area".
"Ben’s family, friends and colleagues are assisting the investigation by speaking with the local community to gather further information and they are also arranging additional leaflets and posters for which we are grateful”.
The wife and relatives of a Pembrokeshire man who disappeared without trace after leaving the Six Nations match at the weekend have issued a desperate appeal to try and find him.
Police have released CCTV pictures of 34-year-old Ben Thompson in the Leckwith area of Cardiff on Saturday night.
Our Correspondent Carole Green has tonight's top story.
Marc Thompson said the "hardest thing is not knowing" where his twin brother Ben is.
The 34-year-old from Haverfordwest has been missing since Saturday, after he watched Wales' Six Nations game at the Millennium Stadium.
He told our Correspondent Carole Green that this would be "very out of character" for him not to contact his family.
The wife of missing Haverfordwest man Ben Thompson has made an emotional appeal to the public to "please help me find my husband."
Jo Thompson described the 34-year-old as "kind and loving", and "loved by everyone who knows him."
The family of Ben Thompson, missing in Cardiff since Saturday evening, have appealed for help to find him.
His wife, mother and twin brother were all at a press conference this afternoon.
His brother-in-law Mark Coles pleaded: "as the situation becomes more dire, we need your help."
He said Ben had "some knowledge of Cardiff" and they thought he was trying to get back to his hotel near Cardiff Airport on Saturday evening.
Ben had been "excited about the [Six Nations] rugby" and had had a "wonderful day" out.
Ben is an operator at South Hook LNG in Milford Haven, and lived with his wife in Haverfordwest.
She said they were "doing this [appeal] for Ben."
His brother-in-law described him as an "athletic, hardworking, dedicated, wonderful guy".
A group of around 30 people including Ben Thompson’s wife Jo, friends and colleagues have made the journey from Haverfordwest to Cardiff and are being kept updated on the search.
– Chief Inspector Eddie Ough, South Wales Police
Ben’s family and friends are getting increasingly worried and we are keeping them fully updated on our search.We would like to thank members of the public who have responded to our appeals for information.
We are now particularly keen to hear from anyone who has seen Ben since 7.17pm on Saturday.
Ben is described as 5ft 9in tall, with short brown hair, blue eyes, and was last seen wearing brown leather lace-up boots, blue jeans, and a white shirt with blue thin stripes.
Police say new CCTV footage shows missing Haverfordwest man Ben Thompson in the Leckwith area of Cardiff on Saturday night, shortly after he was last seen by a colleague in the city centre.
The footage is from 7.17pm, the latest he has been pictured.
He appears to have come from the direction of the Jubilee Recreation Ground.
Officers say they are "now particularly keen to hear from anyone who has seen Ben since 7.17pm on Saturday."
Anyone with information is asked to call Cardiff Bay Police Station on 02920 338 465.