LANSING (AP) — Gov. Rick Snyder is joining President Donald Trump’s call to lower Michigan and U.S. flags to half-staff through sunset on Saturday to honor the victims of the mass shooting at a bar in Thousand Oaks, California.

Michigan residents, businesses, schools, local governments and other organizations are encouraged to display the flag at half-staff. Flags should be returned to full-staff Saturday evening.

When flown at half-staff, the U.S. flag should be hoisted first to its peak for an instant and then lowered to half-staff. The flag should again be raised to full staff before being lowered for the day.

Authorities say a Marine combat veteran opened fire Wednesday night at the Borderline Bar and Grill in Thousand Oaks, killing 12 people before apparently taking his own life.