President Donald Trump has ordered that U.S. flags be flown at half-staff to honor those killed in the mass shooting at a Texas church, Fox News reported.

Trump, who is in the midst of a lengthy tour of Asia, issued a proclamation late Sunday ordering that American flags flown at the White House, all public buildings and grounds, and military posts be flown at half-staff through sunset on Thursday.

Authorities say 26 people were killed and about 20 others were wounded Sunday after a man opened fire inside First Baptist Church in Sutherland Springs, about 30 miles southeast of San Antonio.