Authorities served a search warrant on Thursday morning at a home belonging to the grandmother of Aramazd Andressian Jr., a five-year-old South Pasadena boy who went missing in late April.

The Los Angeles County Sheriff’s Department said in a release that authorities retrieved "various items of evidence" from the home on the 500 block of North Via Val Verde in Montebello. The home belongs to the mother of Aramazd Andressian Sr., the boy's father.

The nature of the evidence, as well as the reasons for searching the home, were not disclosed.

The search comes a week after authorities and officials investigated South Pasadena's Arroyo Park for a second time (after a tip had surfaced), combing the area with drones and cadaver dogs. No evidence was discovered from that search, reports KTLA.

Aramazd Andressian Jr. has been missing since April 22. He was reported missing by his mother, Ana Estevez, after the boy and the father had failed to show up at a planned meeting where the child was supposed to be transferred to Estevez. Andressian Sr. and Estevez are separated and share custody of the child.

The same day the boy was reported missing, Andressian Sr. was found unconscious in Arroyo Park. He was next to his BMW, which had been doused in gasoline. Authorities say they'd also found matches and a gas can inside the vehicle, and that Andressian Sr. had admitted to taking medication that wasn't prescribed to him. Andressian Sr. claimed he had no knowledge of his son's whereabouts. He was held briefly on charges of child endangerment and child abduction, but was released on lack of evidence.

Anyone with information is encouraged to call the Sheriff’s Department Homicide Bureau at (323) 890-5500. If you wish to remain anonymous, you can call Crime Stoppers at (800) 222-8477.