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York Regional Police say a 23-year-old man is in custody after four people were found dead in a Markham home Sunday afternoon.

Police said officers were called to a home on Castlemore Avenue, near Mingay Avenue and southwest of Major MacKenzie Drive East and Markham Road, just before 3 p.m. with a report multiple people may have been injured.

“When our officers arrived, they were met by a man at the front door. That man was placed under arrest. We have a 23-year-old man at custody at this time,” Const. Andy Pattenden told Global News Sunday evening.

“Inside the residence, when our officers went in there they did locate four people deceased.”

WATCH: York Regional Police confirm number of victims in alleged Markham homicide (July 29)

0:59 York Regional Police confirm number of victims in alleged Markham homicide York Regional Police confirm number of victims in alleged Markham homicide

Officers appealed for witnesses to come forward, calling the deaths “suspicious.”

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The coroner was called to the scene. The people inside the home weren’t identified by police.

Pattenden said police were bringing in significant resources to assist officers on scene.

WATCH: Man in custody after 4 bodies found in Markham home. Morganne Campbell reports.

1:31 Man in custody after 4 bodies found in Markham home Man in custody after 4 bodies found in Markham home

“We want to reassure the community that we do still have that person in custody. So it is an ongoing investigation,” he said.

Anyone with information is asked to call or email police at 1-866-876-5423 ext. 7865 or homicide@yrp.ca, or to call Crime Stoppers anonymously at 1-800-222-8477.

Dozens of residents are lining the street watching police as they work. So far the coroner has come and gone from the scene. @globalnewsto pic.twitter.com/2asqfpklUS — Morganne Campbell (@Morganne_C) July 29, 2019

SUSPICIOUS DEATH INVESTIGATION – Police on scene at a residence on Castlemore Avenue, east of Mingay Avenue, Markham. Four people were found deceased inside the residence. One man is in custody. More updates to follow. — York Regional Police (@YRP) July 28, 2019