Alarm spread through California agricultural centers Tuesday as panicked workers reported that federal immigration authorities were showing up at farm fields and packinghouses from the Central Coast to the San Joaquin Valley.

Large-scale immigration raids at packinghouses and fields in California are threatening businesses that supply much of the country’s food, farm bureaus say.

NBC’s Jacob Soboroff reports from Ventura County, where ICE raids have reached California’s agricultural heartland, sparking fear among farm workers and their families. Advocates say the enforcement actions are keeping parents from schools and homes,