Christianson added that 32-year-old Arriaga, a Mexican native, was found to have two prior DUI convictions and have ties to a criminal gang. The ICE said it now has placed a detainer on Arriaga and put in custody six others who were accused of attempting to help Arriaga flee back to Mexico.

California passed a statewide sanctuary policy that took effect in early 2018, which limited local authorities' cooperation with federal officials in enforcing the nationwide immigration law in the state.

As a sanctuary state, California said the policy was put in place to reduce the fear of deportations and family break-ups among people who are staying in the United States illegally, so that they would be more willing to report crimes to local police departments and use health or social services.

U.S. President Donald Trump has been critical of California's sanctuary policy, and cited Singh's death when ramping up his call for getting tough on border security in the southern United States.

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