The search continues for an Alabama toddler discovered missing after a crash that killed his father and sister, and critically injured his mother.

Law enforcement officers searched the property at family’s Winfield home Wednesday night and returned Thursday with police dogs. The house is surrounded by yellow police tape.

Andy Hamlin, district attorney for the state’s 24th Judicial Circuit which includes Fayette County, said Thursday his office is assisting in the investigation.

“This case has been the top priority of all agencies involved since a vehicle crash brought his disappearance to our attention 11 days ago,’’ Hamlin said.

The prosecutor said authorities have made a great deal of progress and expect to release more information in the coming days.

Kahleb Collins has not yet been found.

“We are aware of the high public interest in this case and appreciate the community’s concern,’’ Hamlin said.

“In cases like this, we must carefully balance transparency with the need to protect the integrity of a very active and complex investigation.”

“We ask the public to be cautious about unverified information circulating on social media,’’ Hamlin said.

The investigation began Dec. 8 when Kahleb’s father, 40-year-old Steven Bradley “Brad” Collins, his sister, 2-year-old Ryleigh Collins, and mother, 22-year-old Wendy “Pam” Bailey were in a horrific crash on Fayette County 73 near Morris Cemetery Road, about two miles south of Glen Allen.

A crash report said Collins was driving 92 mph hour on the road that had a 45-mph speed limit.

“The driver …was driving aggressively at an extreme rate of speed,’’ the ALEA trooper wrote. “Due to his actions, the driver was unable to operate his vehicle safely on the wet roadway.”

The wreck happened when Collins was trying to negotiate a curve to the right, according to the report.

The force of the impact caused Collins and his wife to be ejected from the truck. They were not wearing seat belts.

Ryleigh Collins, who was unrestrained in the back seat, was pronounced dead on the scene at 11 a.m.

Collins, who worked for a roofing company, was taken by ambulance to UAB Hospital where he died the following day at 1:06 p.m.

Bailey was airlifted to UAB where she remains in critical condition. Authorities said she regained consciousness earlier this week.

Following the deadly crash, investigators learned that the family’s 1-year-old son was missing.

The Fayette County Sheriff’s Office on Monday issued a press release saying Kahleb had been missing since the Dec. 8 single-vehicle crash.

The Alabama Law Enforcement Agency on Tuesday issued a missing alert for Kahleb.

The boy’s grandfather, 55-year-old John Elton Bailey, is charged with failure to report a missing child and allege that Kahleb was last seen Sept. 4.

The criminal complaint states Bailey “failed to report a missing child by delaying to make or failing to cause to be made the report with willful and reckless disregard for the safety of the child and the child suffered serious bodily harm or death, to wit: physical injuries to the child and the child was removed from the home and taken to an unknown location and no report was made by any resident of the home.”

Bailey was arrested Dec. 11 and remains held in the Fayette County Jail on $100,000 bond.

One of Bailey’s appointed attorneys, James Standridge, said the public defender’s office is now working to learn the facts of the case prior to the preliminary hearing which is set for Jan. 15.

“From now until then,’’ Standridge said, “we will be gathering facts and conducting an investigation and see if we can find out what the true facts are.”

John Bailey is Wendy Bailey’s father and lived with the family in Winfield.

Brad Collins on Nov. 6 posted this on Facebook: “Our son is not doing well. He is not growing has major back issues. His organs are growing but not his body. He has to have surgery at some point. Keep him in your prayers. Been rough and just seems going to be a long rough road ahead of us.”

Anyone with information is asked to call the sheriff’s office at 205-932-3205, the State Bureau of Investigation at 334-676-7894 or Hamlin’s office at 205-367-9915.