Immagration officials arrested 300 foreign nationals who had commited serious crimes this week, according to the New York Times.
Federal agents deported or detained the immigrants in the largest operation ever aimed at illegal immigrants with criminal records.
More than 80 percent had convictions for serious or violent crimes and more than 100 have been removed from the country.
About 400 officers and agents took part in the operation, which is part of a new program to arrest and deport immigrants with criminal records, according the Los Angeles Times.
The program has expanded rapidly since its start in 2003, and has recently ended a requirement to fill quotas which led to officials arresting immigrants with no criminal record.