The city of Bend, Ore., is praising those who worked to stop the gunman at Silver Rail Elementary School. The authorities are searching for answers.

© Jordan Gale for The New York Times

Megan Lambert graduated from high school in the district where she taught. She died in a classroom with Rhoam Summer and two other children when a shooter attacked.

© Jordan Gale for The New York Times

The state has passed restrictive measures popular among gun safety activists. The Silver Rail Elementary School shooting seemed poised to set off conversations about gun control.

© Joe Kline/Associated Press

A long string of school shootings have stricken the nation over the last three decades.

© Joe Kline/Associated Press

An executive with the Republican super PAC that paid for the ad attacking Troy Jackson, the Democratic Senate candidate in Maine, blamed its vendor for running the ad in Oregon.

© Ryan David Brown for The New York Times