Three men have been convicted of first-degree murder and other crimes in the deaths of three firefighters who died in fires that erupted in western Oklahoma, authorities said.

The Oklahoma City Fire Department says the four men died after they fought to save lives during the blaze that started on March 8, 2017.

Three were identified by authorities as James Thomas, 22; Joshua C. Davis, 20; and Joshua L. Davis III, 23.

They were sentenced Wednesday in a Tulsa court and have until Dec. 5 to post bond.

The others face charges of arson, reckless conduct, first- and second-degree manslaughter, arson, first degree murder, and other offenses.

The case sparked an investigation into the deaths that lasted more than two years.

Authorities say the men started their fire to protect themselves and others from smoke that was choking their home.

Authorities said that was not enough.

They were caught on video using their fire extinguishers to fight the flames, while a woman in the home watched and laughed as they did so.