CHICAGO (CBS) — Police are investigating a double murder in the far north side West Ridge neighborhood, and a fire apparently set to cover it.

Smoke coming from a third floor apartment prompted neighbors to summon firefighters to the courtyard apartment building at 6438 N. Sacramento Av., shortly before 4 p.m. Tuesday.

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Fire Department spokesman Larry Langford said the fire was put out in a matter of moments. When firefighters found the bodies of the victims, a man and a woman, they immediately summoned police, who took over the crime scene.

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Authorities said it appeared that both had been stabbed to death, and that the killer then set the fire using an accelerant.

Area North police detectives are investigating.

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LISTEN: WBBM Newsradio’s Bob Roberts reports