Police in Ontario ended a search Saturday for more body parts after the grisly discovery of a woman's torso in the Niagara River.

Niagara Regional Police say they have completed their search of the whirlpool to the Niagara Falls.

Investigators are calling it a homicide, but say it has been difficult to determine where exactly the torso may have entered the water and where the crime scene may be located.

Police say the search will resume if new information becomes available.

Passersby alerted authorities Wednesday after discovering the floating torso in the river.

Preliminary post-mortem results indicates the torso belongs to a Caucasian woman between 20 and 40 years old.