Dec. 5, 2011 -- The investigation into the disappearance of 2-year-old Bianca Jones concentrated today on the girl's father as police searched his home.
Detroit police confirmed that D'Andre Lane's home was being searched today.
"It's unknown if that search is complete," said Detroit police spokesman Phillip Cook.
Bianca's father claimed he was carjacked at gunpoint Friday while his daughter was in the back seat. Thirty minutes later, Lane's gray Grand Marquis was found six blocks away in an alley with the door open and the engine running. But Bianca wasn't inside.
Sources tell ABC News affiliate WXYZ-TV in Detroit that Lane failed a polygraph test on Friday.
Detroit police would not confirm that information.
On Sunday, Detroit Police Chief Ralph Godbee released a statement saying,"In the interest of allaying some of the fears of the public regarding the apparent randomness of Bianca's disappearance, the authenticity and credibility of the original version of events is under intense scrutiny by our investigative team."
Lane, 32, remains in custody on "unrelated warrants," but Cook said the only person of interest in the case is the man depicted in the police sketch, the car jacker Bianca's father described.
Lane is "not being charged with anything," said Cook.
Bianca's father has spent time in prison on weapons and narcotics charges and some family members have said they doubt his story. According to WXYZ-TV Lane called his girlfriend about the alleged carjacking before calling police.
The FBI, Detroit police and the Wayne County Sheriff's Department continue to search "in the area where the vehicle was recovered," said Cook.
They are being assisted today by "at least 100 volunteers," Cook, said, who will gather at the Metropolitan United Methodist Church to search from 10 a.m. until 8 p.m.
"There's no limit to the perimeter of the search," said Cook.
Bianca's mother, Banika Jones, has issued a public appeal for help.
"Please just bring Bianca home. No one is concerned with persecuting you," Jones pleaded over the weekend. "We would just like you to please bring Bianca home. We love Bianca, we miss Bianca, we need Bianca."
Godbee said the reward for information leading to Bianca Jones' return is now at $17,500, thanks to a anonymous businessman's $15,000 donation and a $2,500 reward from Crimestoppers.
Sunday morning, Godbee released a statement saying,"In the interest of allaying some of the fears of the public regarding the apparent randomness of Bianca's disappearance, the authenticity and credibility of the original version of events is under intense scrutiny by our investigative team."
Police say two people were involved in the carjacking. They released a sketch of one, and these two descriptions:
"Suspect No. 1: A black male, approx. 6 feet tall, 190 pounds, wearing a black jacket with a red shirt underneath, dark pants and a brown and black hat, a thin scraggly beard, armed with a blue steel revolver. Suspect No. 2: Undescribed, except that he is said to have exited a small red, boxy-styled car."
"The most important thing right now for us is to locate 2-year-old Bianca Jones. She was last seen wearing, according to her father, a purple coat, pink tights, pink shoes," Godbee said. "From the mother's description -- she may look like she's 3 or 4, because she's a little tall for a 2-year-old."
If you have any information relating to the disappearance of Bianca Jones, please call 313-596-2260.