Story highlights The shooter was killed, interim police superintendent tells reporters

They were shot on Chicago's West Side, according to CNN affiliates

All sustained injuries that are not life-threatening

(CNN) Three Chicago police officers were shot Monday night on the city's West Side during an investigation into possible narcotics activity, authorities said.

All three sustained "lower-body injuries" that are not life-threatening, Interim Police Superintendent John Escalante told reporters at a press conference.

Officers from the city's 11th District Tactical Unit were keeping an eye on a courtyard when they saw a male and a female, who were under investigation, at the scene, Escalante said.

When police approached and tried to speak with them, the man produced a handgun and started shooting at them.

The male was killed, while the female was not struck. Escalante said authorities are interviewing her.

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