A fire official announced the city has identified the “seat” — origin — of the explosion, but did not specify the exact site.

“We do have a large crater,” Assistant State Fire Marshal Kelly Kistner said.

Fire officials also announced plans for a memorial service at Baylor University in Waco, Tex., on Thursday, in honor of the volunteer firefighters who died in the explosion.

“It hits close to home for us all,” said Joe Ondrasek, an executive board member of the Texas Line of Duty Task Force.

At Sunday’s briefing, officials read statements by some of the families who lost loved ones.