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(CNN) - Buffalo police are looking for the parents of a 3-year-old boy who was found sleeping on a porch Monday morning, a police department publication said.
The boy was wrapped in a blanket inside a cardboard box that had been left for cats, said WIVB, a CNN affiliate. He was wearing only a diaper, the affiliate said.
"He is a very sweet child and gives lots of hugs and kisses," his grandmother, Zenaida Colon, told the affiliate.
The mother, father and a friend of the child's family, who live in Florida, were expected to arrive in Buffalo, New York, Sunday night and are now being treated as missing persons, said the police captain of Buffalo, Jeff Rinaldo.
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The police identified them as Nicole Merced Plaud, 24, Miguel Anthony Valentin-Colon, 31, and Dhamyl Mirella Roman-Audiffred, 29, respectively.
"Buffalo police are trying to get in touch with these three people or talk to anyone who has seen them in recent days," police said.
The child is currently in the care of Child Protective Services, the affiliate said Wednesday.
Burned vehicle with possible human remains
Police also discovered a burned vehicle in the Black Rock neighborhood of Buffalo, Rinaldo said Tuesday. It is estimated that the fire occurred early Monday morning, he said.
The vehicle possibly had human remains inside, Rinaldo added, but said identifying those remains would take time and require forensic anthropologists due to the severity of the burn.
The fire burned for so long "almost to the point that we cannot say what type of vehicle it is or its contents," he said.
The vehicle was found 1.5 km from where the child was discovered, WIVB reported.
Investigators have not connected the burning car to the case of missing persons at this time and are treating it as a separate homicide case.
Natalie Johnson of CNN contributed to this report.
