President Obama on Monday ordered flags on all public buildings across the country flown at half-staff to honor the three Louisiana police officers who died and the three others who were wounded during Sunday when a Missouri man ambushed and killed the officers in Baton Rouge.

U.S. flags were already being flown at half-staff to express solidarity with France and honor the 84 people who died in Nice when a terrorist drove his truck into a crowd celebrating Bastille Day last week. He also ordered flags to be flown half-staff starting July 8 in honor of the five police officers who died in Dallas in a sniper ambush.