WATER police and divers searched the Condamine River yesterday for missing Warwick grandmother Gail Lynch.
The search area has been extended to a 15km radius from the city centre.
Ms Lynch has been missing for 12 days.
Detective Inspector Darrin Shadlow is heading the search and has 12 police involved.
"Police divers searched the Condamine River at Warwick yesterday," Det Insp Shadlow said.
"We have undertaken further ground searches.
"The SES has driven most roads in a 15km radius of Warwick and checked each culvert and a lot of watercourses.
"Detectives are still talking to a number of people in the Warwick and Toowoomba areas.
"We are seeking more information from anyone who saw a blue 2004 Ford Falcon in the Warwick area between 6pm on July 3 and 6am on July 4."
Detectives are in constant contact with Ms Lynch's family.
"They have been very helpful but we have grave fears for the woman's safety," Det Insp Shadlow said.
Police have received a number of calls to Crime Stoppers in relation to the vehicle and other information.
"I don't care if people think information is irrelevant, we would prefer they contact us," Det Insp Shadlow said.
State Emergency Service volunteers from Warwick, Stanthorpe and Wallangarra were part of the search at the weekend.
There were 25 volunteers on Saturday and 15 yesterday.
Search and rescue co-ordinator Senior Constable Russell Joyce said divers searched each side of the Scots Weir yesterday morning.
"The water police sonar doesn't work near a weir like at Scots," Sen Const Joyce said.
"All they found were a few logs and Main Roads signs."
After lunch yesterday, the SES boat was used by water police upstream from the McCahon Bridge to create sound waves (images) from the river.
No sign of the missing woman was found but more sonar testing will be done in the river today.
If you have any information contact Warwick police on 46604444 or Crime Stoppers on 1800333000.