President Trump has ordered U.S. flags flown at half-staff to honor the victims of this week’s mass shooting at Marjory Stoneman Douglas High School in Parkland, FL.

Flags should be flown at half-staff until sunset Monday, Feb. 19.

Facilities that fly the flag at all times and are closed Feb. 19 for Presidents Day should lower the flag to half-staff when the facility closes prior to the holiday. Return the flag to full staff when the facility opens Tuesday, Feb. 20.

To fly the flag at half-staff, hoist the flag to the peak for an instant and then lower it to the half-staff position. The flag should be raised to the peak again before it’s lowered for the day.

Source: USPS