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Police investigate a scene after a St. Louis police officer was shot in what the police chief called an "ambush" on Sunday, Nov. 20, 2016, in St. Louis. Police Chief Sam Dotson said the 46-year-old officer was shot in the face. The suspect got away and a massive search was underway. (David Carson/St. Louis Post-Dispatch via AP)
Police investigate a scene after a St. Louis police officer was shot in what the police chief called an "ambush" on Sunday, Nov. 20, 2016, in St. Louis. Police Chief Sam Dotson said the 46-year-old officer was shot in the face. The suspect got away and a massive search was underway. (David Carson/St. Louis Post-Dispatch via AP)

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Officer killed and 3 others wounded

Four officers were shot Sunday in separate incidents around the country leaving three injured and one dead. CNN's Polo Sandoval reports.

Officer killed and 3 others wounded

Four officers were shot Sunday in separate incidents around the country leaving three injured and one dead. CNN's Polo Sandoval reports.