During a news conference Sunday afternoon, Officer Charley Davidson said officers and canine units had searched both his home and neighborhood with no luck.
The Wichita Eagle reports that police said they received a call at about 6:15 p.m. Saturday to report Lucas Hernandez was lost in southeast Wichita. She said she last saw Lucas in his bedroom at approximately 3 p.m. Saturday, prior to her taking a shower and falling asleep.
The Kansas Department for Children and Families, of which Child Protective Services is a part, said it couldn't share any information on its cases either but expressed worry for Lucas. Authorities are planning more searches, but Davidson did not say where.
Authorities searched the boy's home and his neighborhood. There was no sign of Lucas.
Police, family members and friends spent hours overnight searching for him.
"I think that it's good to see people in this community treating Lucas like he's their child", Lucas' father said at a prayer vigil Monday evening. Officers were seen going door to door questioning area residents in the case. "This is a serious thing and we want him home".
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Cruz faces 17 counts of premeditated murder in the massacre and, law enforcement officials said, confessed to the massacre. Shortly before that, Cruz briefly lived with a family in the nearby town of Lantana, Florida .
The Federal Bureau of Investigation is also involved in the search.
Authorities tell KAKE News that an Amber Alert has not been issued because there is no evidence that the child was abducted. At the time, he was last seen wearing black sweats, white socks and a gray shirt with a bear on it.
Lucas was born December 12, 2012, has brown eyes and hair, is around 4 feet in height, and weighs about 60 pounds.
A teacher who works for Beech Elementary School in Wichita, where the child goes, confirmed he's enrolled there. Instead, they encourage the public to share the boy's flyer.
The Wichita Police Department at its daily briefing Tuesday encouraged anyone with information that could help them in the search for a five-year-old Wichita boy to call its Emergency Operations Command Center tip line at 316-383-4661.
Two relatives of the boy told the Wichita Eagle they had concerns about the boy's welfare in the past, and the child's great aunt said she contacted the Kansas Department of Children and Families last spring.