One person remains hospitalized and at least 150 people were displaced after the explosion and fire.
Montgomery County Fire and Rescue Services Chief Scott Goldstein said his department cannot say what specifically ignited the fire in which 14 people were hospitalized. Goldstein said his department is wrapping up the investigation at the site.
According to Goldstein, the maintenance worker was trying to fix a clogged drain in an apartment, using a snake to remove debris and sort out the clog. The worker went to the unit below that apartment and cut what he believed to be a drain waste pipe to remove the clog and put a cap on the pipe. Of the 14 people taken to hospitals for treatment, three of them were initially listed in serious condition. Since the explosion, 12 people have been discharged from the hospital and one person remains in critical condition. All residents of the apartment complex have been accounted for, officials said.