A Northern California sheriff's office said Tuesday it allowed federal immigration officers to enter its jail and interview four inmates in violation of its sanctuary policy.
Members of the staff "mistakenly permitted ICE entrance to our jail" on March 7 and 8, Santa Clara County Sheriff Laurie Smith said.
The county "has a policy of not cooperating with ICE operations," Smith said in a statement, which was first reported by the San Francisco Chronicle.
Smith said none of the four inmates were detained by U.S. Immigration and Customs Enforcement officers. After learning of the incident, the sheriff's office re-evaluated and strengthened measures for admitting law enforcement agencies to its facilities.
Subsequent attempts by ICE officers to re-enter the facilities on March 14 and March 26 were denied, said Reginald Cooks, a spokesman for the sheriff's office.