A woman has died and a man is in custody following an incident in the city's downtown core Sunday morning, Toronto police say.

Duty Inspector Abdel-Malik said police received a call for "an unknown trouble" in a unit located in the complex near Harbord Street and Ossington Avenue shortly before noon.

He said police entered the unit and found a male and a female.

"The female was pronounced dead and the male was placed under arrest," Abdel-Malik said.

"There is no risk to public safety and no other persons are believed to be outstanding at this time."

Abdel-Malik said the male had "some minor injuries" and was transported to the hospital.

Police believed the man and woman were known to each other, but it's yet to be determined in what capacity.

Anyone who has any information in relation to this incident is asked to call 14 Division at 416-808-1400 or Crime Stoppers.

The investigation is ongoing, police say.