One of the police officers leading the search for April Jones has said he is "very heartened" that the force has received more than 2,500 phone calls with information.
Superintendent Ian John, from Dyfed Powys Police, said police officers from across England and Wales are helping to field the calls.
Wearing a pink ribbon in support of a campaign by the five-year-old's family, Mr John said investigators remain "determined" to find the little girl, who has been missing since Monday. Searches will continue through the night regardless of the weather conditions, he told reporters.
Mr John said: "I want to turn to April's family. I'm sure we all are feeling for them at this terrible time, also the friends and the extended family. I just want to remind everybody that's why we're here tonight, in the pouring rain in Machynlleth, is to focus on the search and do everything that we can to bring this operation to a conclusion."
He added: "I think what we've got to hold on to is that we continue our search, and the good news is that everybody is determined to follow this through."
More than 400 people have registered their contact information and details of any specialist skills with police.
Thanking all the volunteers, Mr John said: "All in all, we've had outstanding co-operation from members of the public, not just from this community. It quite takes you away really, it's quite a humbling experience. Following the appeals for information that we've made, we've received over 2,500 calls from the public."
Earlier, the force was granted until 5pm on Friday to continue questioning Mark Bridger, 46, who has been arrested in connection with April's disappearance.
Detective Superintendent Reg Bevan appealed for information from anyone who saw Mr Bridger or his blue Land Rover Discovery, registration number L503 MEP, between 6.30pm on Monday and 3.30pm on Tuesday.
He said: "We will continue to piece together his movements during the relevant times and look to overlay his account with that we've gleaned from witnesses, sightings and the other inquiries that we are conducting."