Special Operations Supervisor Vincent Dulesky says the migrants were in groups of 30 or more who came illegally between late Friday and early Monday, crossing where there are open gaps or vehicle barriers.
It was not immediately known how many were traveling in families or as unaccompanied children. Authorities have not said what countries they are from.
The Border Patrol in April apprehended nearly 14,000 migrants in its Yuma sector.
- US begins reuniting families at Mexican border in ‘beginning’ of broader effort
- Two border-state Dems break with Biden on the crisis: 'Want to see more action'
- Sheriffs with 2 Arizona border counties say there is no crisis at the US-Mexico Border
Tune in to FOX 10 Phoenix for the latest news: