Police are focusing their search on areas suggested by information provided by Mr Bridger, who is being further questioned today.
Detective Superintendent Reg Bevan asked anyone who had seen the suspect to come forward, adding: "If you have the smallest information it could be crucial to this investigation."
He said that the former soldier was arrested on the A487 just north of the River Dyfi bridge walking in the direction of Machynlleth.
"The Land Rover Discovery was recovered from a garage in the Old Station Road area of Machynlleth on Tuesday afternoon."
He appealed to the public for any information regarding Mr Bridger's whereabouts from 5pm Monday to his arrest at 3.30pm Tuesday.
"In relation to this specific investigation we are pursuing a number a number of lines of inquiry one of which is Mark Bridger," he said.
"So please can you look at these images. Did you see that vehicle between Monday evening and Tuesday afternoon?
"Do you know Mark Bridger? And did you see him between Monday evening and Tuesday afternoon?
"If you did, please don't assume that somebody else has already contacted us. Even if you have the smallest bit of information it could be crucial to this investigation."
Detective Superintendent Reg Bevan (Sky News)
"The reg of the Land Rover is L503MEP."
Mountain rescue volunteers and more than 40 officers spent a second night looking for the little girl, who was abducted in Machynlleth, near Aberystwyth, at 7pm on Monday.
Police said the “methodical and systematic” search would continue today, but appealed for the hundreds of volunteers who have been scouring the hills and valleys around the town to stand down.
Mark Bridger's Land Rover Discovery (Sky News)
Detectives yesterday arrested Mark Bridger, 46, a former soldier, on suspicion of April’s abduction, and carried out searches of his home and the L-reg Land Rover Discovery in which she is believed to have been taken.
Vicky Fenner, 25, a mother-of-two, told the Daily Mirror: “It was wet and cold and the other girl told April not to get into it. But April said: ‘It's all right, I know them’.”
Superintendent Ian John, the local police commander, told a press conference in Aberystwyth today: “I’m afraid to say I don’t have any news on April’s whereabouts, but we continue to pursue the search areas that we are planning.
“As today goes on and further interviews with the person in custody [are carried out], we will obviously anticipate intelligence and information coming out of those interviews, which are going to drive where the police search operation will inevitably go from there.”
Officers believe it is most likely that April will be found close to where she went missing, and are continuing to concentrate their searches in and around Machynlleth.
The photo of Mark Bridger shown at the press conference
Last night there was a particular focus on the area along the swollen and fast-flowing River Dyfi, which police admit is proving “challenging” for searchers.
Meanwhile, forensic results on the vehicle seized by police have been “fast-tracked”.
Supt John said police had been “overwhelmed” by the support they have received from the public, but appealed for people to stop carrying out their own searches for the missing child.
He raised concerns about some people who were carrying babies when they went out into “very difficult” terrain to look for April last night.
The senior officer said: “The River Dyfi is in flood, and we really do need to manage the risk of everybody there, not only the police officers and the mountain rescue team.
“We are extremely concerned about large numbers of members of the public going into what I’ve said are very challenging conditions.
“What I am asking is notwithstanding the great support and the commitment that people want to show in helping us to find April, can we please leave this now to the trained and skilled people that we have.”
April’s parents, Paul and Coral Jones, appealed directly to her kidnapper last night, saying: “Last night our lives were shattered when our beautiful little girl April, who was playing with friends, was taken from us.
“We are devastated and our lives have stopped. Please, please, if you have our little girl let her come home to us.
“This is such a small, close-knit community and we plead with anyone who has any information, no matter how small they may think it is, to contact the police immediately. Please help us to bring home our beautiful little girl.”
April was last seen alive by a friend, getting into a vehicle described as a light-coloured van as the two girls played on their bikes less than 100 yards from April’s home.
Mr Jones, 43, and his wife, 40, reported April missing immediately, and it emerged last night that they had told police who they suspected the driver of the car was.
Mr Bridger, a father-of-six, who was known to April’s family and had lived near her at various times, was arrested at 3.30pm yesterday as he walked along a main road to the north of the town.
Neighbours said he was a former soldier who had worked as a lifeguard, a welder, and at a slaughterhouse. He had two vehicles, one of which was a left-hand drive Land Rover Discovery made in Spain.
Ben Edwards, 22, a neighbour, said: "He is a nice guy, and absolutely brilliant with his son and daughter. He was always putting his kids first."
Mr Edwards’s mother, Gloria, said she had seen Mr Bridger shortly before he was arrested. He was walking quickly towards the bridge that led into the town, wearing sunglasses and a khaki jacket and with his head down.
Officers were understood to have begun searching the river after tyre marks were found on the bank at a spot where vehicles would not normally be parked. Mr Bridger has an ex-wife and a grown-up son who live on the same estate as April, as well as two ex-girlfriends living in Machynlleth.
Dfyed Powys Police plan to hold another press conference at 1pm.