A total of 18 people were killed in the three shooting episodes.
The latest took place on the top floor of a small office building in the city of Orange in southwestern California. The suspected perpetrator received gunshot wounds and was taken to hospital. The condition is critical.
The police state that they are working to determine whether the injuries were self-inflicted or whether the person was shot by the police.
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It is currently unclear what was the motive for the crime.
According to local media, there is an insurance company, a shop that repairs mobile phones and a financial consulting company in the building.
The police have not provided information about the victims’ identities, but say that a fifth person has been hospitalized.
A man who is interviewed by the local TV station KTLA% describes the situation as terrible.
Police officer Jennifer Amat states that the city has not experienced such a massacre since 1997.
– It is such a tragedy for the victims, their families, our local community and our police force, she says.
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Colorado og Georgia
In March, the United States was hit by two mass shootings, which led to a new debate on stricter gun control.
On March 22, ten people were shot and killed in a grocery store in Boulder, Colorado. A 21-year-old is charged with the murders.
Less than a week earlier, eight people were killed at two massage parlors in Atlanta, Georgia, six of whom were women with Asian roots. Here too, the suspected perpetrator is a 21-year-old man. The shooting is being investigated as a possible hate crime.
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