A six-year-old girl was seriously injured after falling from an apartment balcony in northwest Toronto on Tuesday.

Police were called to an apartment at 2900 Jane Street, south of Finch Avenue West, shortly after 2:10 p.m.

Insp. Norm Proctor, of the Toronto Police Service, said when officers arrived they found the girl in medical distress on the north side of the building.

"Investigators are still looking at video and speaking to witnesses to try to figure out exactly what happened," Proctor said.

Proctor said the girl lives in a unit on the 12th floor, but police have not determined if she fell from that floor.

Toronto paramedics took the girl to a trauma centre in serious but stable condition, according to deputy commander Steve Henderson.

The child was taken to hospital via emergency run. Proctor said the girl was conscious and breathing when she was transported.

The girl fell in an area cordoned off by police tape, according to Insp. Norm Proctor of the Toronto Police Service. (CBC)

Const. David Hopkinson, spokesperson for the Toronto Police Service, said the fall is considered suspicious.

Police are trying to determine what happened before the incident and how she fell.

"We don't know how the child is doing," Hopkinson said.

"This is being investigated. We are treating it so far as suspicious until we know exactly what happened."

Police are trying to speak with the girl's parents, he added.

Anyone who has relevant information, or cellphone or dashboard camera video, is urged to call Toronto police at 31 Division.

Officers have taped off the area where the child fell.