One police officer was killed and three wounded in nighttime shootings in two Florida cities where the officers were responding to suspected drug activity and reports of a suicide attempt, police said Saturday.

One officer was killed and another gravely injured late Friday night in Kissimmee. The other two officers were wounded a couple of hours later in Jacksonville, one of them shot in both hands and the other in the stomach. Three of four suspects in the Kissimmee shooting were arrested, and the shooter in Jacksonville was shot and killed when police returned fire, CBS News reports.

In Kissimmee, officers Sam Howard and Matthew Baxter were checking suspects in an area of the city for drug activity when they were shot, Kissimmee Police Chief Jeff O'Dell said at a news conference. They did not have an opportunity to return fire.

In the northern Florida city of Jacksonville, police responded to reports of an attempted suicide at a home where three other people were thought to be in danger, Sheriff's Office Director Mike Bruno said.

Officers heard gunshots inside and feared "an active shooter situation" so they approached the house, Bruno said. The suspect then came out firing a high-powered rifle. He was shot and killed, and two of the officers were wounded in the exchange of fire. The three other people in the house were safe, Bruno said.