Toronto police are investigating after two people who were found critically injured in an apartment in midtown Toronto have died in hospital.

Emergency crews were called to 141 Davisville Avenue, east of Yonge Street, just before 12:30 p.m. for unknown trouble.

When police arrived, they located two people inside an apartment unit with obvious injuries, Const. Allyson Douglas-Cook said.

She said at least one of the victims was found without vital signs.

Paramedics said a man and a woman were taken to hospital in life-threatening condition. Both were later pronounced dead in hospital, police said.

"We are investigating it as a criminal matter as we do for the circumstances like this where we are uncertain," Douglas-Cook said.