Yet another American city has joined the seemingly endless list of places impacted by mass killings at the hands of a gunman. This time, it's Louisville, Kentucky, where four victims were killed and nine others injured, including two police officers. It came two weeks after a school shooting in Nashville killed three children and three adults. Lisa Desjardins reports.

Correction: The gunman in Louisville was 25 years old. Previous information from authorities erroneously stated the gunman's age as 23.

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