TUCSON, Ariz. -- The Tucson Police Department is looking for five potential witnesses who may have information about the disappearance of 6-year-old Isabel Celis.
The first-grader disappeared from her home between the hours of 11 p.m. on April 20 and 8 a.m. on April 21. Police said a window was open with the screen pushed aside.
Isabel is described as 3 feet 8 inches tall and weighing 44 pounds, with brown hair and hazel eyes.
On Friday afternoon, police said they believe two males and three females were walking near Isabel's neighborhood the night she disappeared and they are asked to call 911 as soon as possible.
Police released surveillance video of those individuals taken while they were walking in a parking lot.
It is believed the group was walking eastbound along the northern side of Saint Joseph's Catholic Church, located at 215 S. Craycroft Road, at approximately 1 a.m. to 1:30 a.m. on April 21, according to Sgt. Maria Hawke. They may have been walking in the direction of or directly to East Cooper Street.
The group may have been leaving the area of the Cactus Moon Nightclub or Risky Business Restaurant and Bar located in the area of East Broadway Boulevard and South Craycroft Road.
Police are also looking for anyone who took video during a baseball game that Isabel's family attended the night before she disappeared.
Tucson police used sonar equipment to search underwater at several city parks, but they haven't found any sign of her.
A woman who lives next door to the Celis family said she heard two male voices and dogs barking outside her bedroom window during the time of Isabel's disappearance.
"I didn't really think anything of it because it was light outside and I thought maybe someone was going for a walk," Alicia Stardevant said.
There is a $30,000 reward for information that leads to Isabel.