Border Patrol chopper forced down, Illegal immigrants in Arizona threw rocks

(CNN) -- Rock-throwing illegal immigrants near Yuma, Arizona, forced a U.S. Border Patrol helicopter pilot to make an emergency landing this week, the customs agency said.

No one was hurt in the incident, which happened Tuesday while the pilot was helping agents on the ground apprehend 17 people attempting to illegally enter the U.S., spokesman Michael Gramley said. They were on the north side of the All-American Canal, a large irrigation canal that runs from California along the U.S.-Mexico border.