The 21-year-old suspect in shootings at three Atlanta-area spas has been charged with eight counts of murder and homicide and one count of aggravated assault, police said Wednesday.

Robert Aaron Long was charged with four counts of murder and one count of aggravated assault in the attacks in Cherokee County, according to the sheriff’s office there. The Atlanta police said later Wednesday afternoon that he was also charged with four counts of homicide in the killings in that city.

Six Asian women died in the attacks on Tuesday, prompting widespread concern that the killings could be the latest in a surge of hate crimes against Asian Americans.

Here’s what to know: