PIERRE, S.D. — South Dakota Gov. Dennis Daugaard has ordered flags flown at half-staff Monday to honor those killed in the Sept. 11, 2001, terrorist attacks.

Daugaard asked that the flags remain at half-staff from 8 a.m. until sunset Monday. Nearly 3,000 people lost their lives in the attacks.

Sept. 11 has been designated as Patriot Day and National Day of Service and Remembrance.