KANSAS CITY, Mo. (AP) — Search crews at the site of a massive explosion that destroyed a popular Kansas City, Mo., restaurant recovered a body Wednesday, and the mayor said the rubble could be concealing other victims.

Mayor Sly James declined to say whether the body was that of a man or a woman, though authorities have been looking for a missing woman who worked at JJ's restaurant and was seen there before the Tuesday evening blast. They previously said she was the only person still unaccounted for after the explosion and fire.

But James said at a news conference Wednesday that authorities can't be "100 percent sure" they have accounted "for every single person that may have been at JJ's when the explosion occurred." The search started without a list of people who were in the building.