Two other officers were injured in the shooting in York County, and the person who fired on the officers was also dead, officials said.

© Matt Slocum/Associated Press

The president’s authority to make demands of local police expires on Wednesday night, but the most visible federal interventions in the city will remain for now.

© Alex Kent for The New York Times

The president’s authority to make demands of local police expires on Wednesday night, but the most visible federal interventions in the city will remain for now.

© Alex Kent for The New York Times

The city is challenging the federal government’s authority to send troops into the city for what the president has called a “public safety emergency.”

© Kenny Holston/The New York Times