A federal grand jury on Wednesday indicted a man who the authorities say killed 11 people in a Pittsburgh synagogue while spewing anti-Semitic slurs on 44 counts, including hate crimes. He could face the death penalty.

The indictment, handed up by a federal grand jury in western Pennsylvania, charges Robert Bowers, 46, with 11 counts of obstruction of free exercise of religious freedom resulting in death, and 11 counts of using a firearm during a crime of violence.

Mr. Bowers pleaded not guilty in federal court on Thursday. The maximum penalty he could receive if convicted is death, or life without parole plus 535 additional years of imprisonment.

“Every American has the right to attend their house of worship in safety,” Attorney General Jeff Sessions said in a statement on Wednesday. “The defendant in this case allegedly murdered 11 innocent people during religious services and injured four law enforcement officers. These alleged crimes are incomprehensibly evil and utterly repugnant to the values of this nation.”