DALLAS - President Barack Obama has ordered flags lowered to half-staff to honor the 12 police officers and two civilians who were shot in an attack in Dallas.

Obama's proclamation Friday applies to American flags flown at the White House and on all public buildings and grounds, military installations and Navy vessels. It extends through sunset Tuesday, July 12.

Gov. Greg Abbott ordered Texas flags to be flown at half-staff statewide during the same time period to honor the victims. Five of the officers were killed. The other seven and the two civilians were wounded.

The attack happened during what had been a peaceful protest over this week's killings by police of black men in Louisiana and Minnesota.

Police say an armed suspect, who was a military veteran, was killed in a robot-delivered bomb blast to end a standoff. Several other people were detained for questioning.