Investigators were pursuing 170 active leads and on Monday were conducting follow-up interviews with people who had given promising clues, Galveston County Sheriff's Office spokesman Maj. Ray Tuttoilmondo said, according to the Galveston County Daily News.
Hundreds of tips from around the country have poured in since authorities released sketches of the unidentified child on Friday. A fisherman found the toddler's body a week ago along the Intercoastal Waterway.
Residents held a memorial service to help focus attention on the case of "Baby Grace," the young girl whose remains were discovered inside a storage box that washed ashore on Galveston Bay.
Attendees to Sunday's memorial service gathered around a 4-foot-tall wooden cross bearing the words "In loving Memory of Baby Grace."
After speeches, prayers, songs and poems, attendees took the cross by boat to the small uninhabited island where the child's body was found.
"This is not the place to end this little girl's life," said Tuttoilmondo. "We won't quit until we figure it out."
Authorities say forensic dental examination has narrowed the girl's age to between 2 and 3 years. She is described as white, 32 to 35 inches tall and 25 to 30 pounds. She had waist-long, wavy blond or light brown hair. She was wearing a Target-brand pink, flowing skirt, a pink or red shirt and white light-up tennis shoes with purple flowers on them.
Several callers believe that the child's body may be that of Madeleine McCann, a 4-year-old British girl whose disappearance from a resort hotel in Portugal in May has made international headlines, Tuttoilmondo said.
"Based on the totality of the circumstances, we do not believe it's her (Madeleine)," Tuttoilmondo said and added that his office is working with the FBI to completely rule out the possibility.
Local authorities and the FBI are going through missing person reports from across country in an effort to identify the girl.
Galveston County Crime Stoppers set up a memorial fund to pay for her funeral as well as an account to offer a reward for anyone who helps to solve this crime.
The Galveston County Medical Examiner's Office ruled the child had been dead for at least two weeks and sustained a skull fracture. The cause of death has not been determined but authorities are treating the case as a homicide.
Anyone with information is asked to call the Galveston County sheriff's Office at 409-766-2222, the agency's tip line at 866-248-8477 or any Crime Stoppers organization.