Federal officials have been mostly mum about the specifics of their actions across the Houston region in recent weeks. In Monday’s announcement, they said federal investigators had executed 71 warrants and arrested more than 543 people accused of crimes and seven gang members as part of the operation. They did not identify the people arrested.

U.S. Immigration and Customs Enforcement (ICE) officials have taken hundreds of undocumented individuals into custody across Houston over the last week.

Federal state and local law enforcement arrested over 600 undocumented immigrants during a week-long targeted enforcement operation in the Houston area, U.S. Immigration and Customs Enforcement officials said.