Jǐngfāng huòzhī xiányírén de xiàluò hòu xùnsù zhǎnkāi xíngdòng.
After the police learned the suspect's whereabouts, they quickly took action.
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获知 is a formal, written word. In everyday speech, 知道了 or 得知 (also formal) or 听说 are more natural. 获知 appears frequently in news reports and official communications.