Louisiana will seek to resume carrying out death sentences in the coming months after a 15-year pause, this time using nitrogen gas as the execution method, the state's attorney general said Tuesday.

Gov. Jeff Landry announced Monday that the state had developed a protocol for executing people with nitrogen gas, allowing it to resume executions after 15 years. At least three district attorneys have since sought death warrants.

That difficulty was part of the reason Louisiana lawmakers legalized the use of nitrogen gas and the electric chair as methods for carrying out death sentences last year. At the time, a group of Jewish citizens appealed to lawmakers to reject the use of gassing, saying it evoked the gas chambers used during the Holocaust.