LINCOLN, Neb. (AP) — Nebraska Gov. Dave Heineman has ordered flags across the state to be flown at half-staff in the wake of a Connecticut elementary school shooting that claimed 26 victims, including 20 children.

A statement released by the governor’s office on Friday said that the order was in accordance with a proclamation from President Barack Obama.

Flags are to be flown at half-staff until sunset on Tuesday.

The killings in Newtown, Conn., appeared to be the second deadliest school massacre in the country’s history, with only the 2007 killings at Virginia Tech claiming more victims — 32 plus the gunman.

A law enforcement official said the gunman shot himself to death.