The Trump administration launched an immigration enforcement blitz nationwide Sunday that included multiple federal agencies and resulted in the arrest of nearly 1,000 people, according to Immigration and Customs Enforcement.

The apprehensions are part of an effort to amass a larger enforcement apparatus by pulling in a range of federal agencies that have been granted extended immigration authority under the Trump administration.

ICE agents were joined Sunday by officials from multiple Justice Department agencies as they targeted what they said are public safety and national security threats.

The operation is expected to continue this week.