The blast at Watson Grinding and Manufacturing happened at 4525 Gessner Road, about an 18-mile drive northwest of downtown, officials said.
Police described the incident as a "building explosion" and warned all traffic to avoid the area in the northwest of the city. He said authorities don't believe the explosion was intentional though a criminal investigation is underway.
"We've assessed between 180, 190 at this point".
"Please search your homes, and if you can, take a look at your roof", Acevedo said.
The explosion happened about 4:30 a.m.at a building at Watson Grinding and Manufacturing, police said.
A doorbell camera caught the dramatic moment a bright flash burst through the night sky, according to video posted to Twitter.
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"We will advise of the possible cause of the explosion as soon as we have concrete info", he said. Police Chief Art Acevedo said one person was unaccounted for after the blast, and the fire department said another person was taken to a hospital for treatment. Officials say they have not seen any negative readings from air quality tests.
Debris flew a half-mile from the explosion site, Acevedo tweeted.
In November, two blasts in the coastal city of Port Neches shattered windows and ripped the doors from nearby homes.
One resident told the local news station that her roof of her home collapsed.
"For me it triggered my PTSD and I thought I was back out in Afghanistan. And then I realized there was no storm", the resident told KTRK.
Authorities say one person is missing following a large explosion at an apparent industrial building in Houston. It busted out every window in our house. Last July, an explosion at an ExxonMobil refinery in Baytown left more than dozen people with minor injuries and put nearby residents under a shelter-in-place advisory for three hours. A fire continues to burn and people have been told to avoid the area. "No evacuation order has been given at this time". Crews were being advised to move away from the area as the response continued. We've heard from parents nearby that Dean Middle School and Bane Elementary are closed today as a result of the explosion.