"We didn't ask for a joint operation, we didn't ask for assistance," Sands said. "They're raising tension in their community over something they shouldn't be concerned about."

He said he could have controlled the demonstrators with 10 deputies. Gascón said about 130 Mesa police participated Thursday and about 70 participated Friday.

The Sheriff's Office said Friday that they had arrested 37 people on the first day of the operation, including 14 undocumented immigrants. It arrested another 13 people on Friday, including two suspected of being undocumented. MORE