A large industrial explosion killed at least two people in the United States city of Houston early Friday, shattering windows and damaging homes as shocked residents emerged to survey the destruction.
The Houston Fire Department says one person was taken from the area of the explosion to a nearby hospital.
The explosion occurred before 4:30 a.m.at the Watson Grinding and Manufacturing facility in northwest Houston, Texas.
A security camera video appeared to show a huge fireball erupting at the moment of the explosion.
Houston police tweeted that they were responding and officers were blocking off streets in the area.
Two people have died as a result of Friday morning's explosion at a Houston manufacturing business, city Police Chief Art Acevedo said.
"I thought it was thunder", said Bruce Meikle, 78, an owner of nearby manufacturer ChemSystems, who heard the explosion from his home about a mile (1.5 km) from the scene.
It's not clear what caused the explosion.
Many homes in the area were damaged, including broken windows and doors, and in at least one case, a collapsed ceiling, CNN affiliates reported.
One person was injured, and another is unaccounted for after a massive explosion at a Houston manufacturing plant damaged several buildings.
Acevedo said there is no evidence that the explosion was intentional, but they will conduct a criminal investigation as part of the process. It busted out every window in our house.
Residents have been advised to avoid the area as law enforcement works the scene.
"We will keep all students inside today as air quality in the area continues to be monitored", the district said on Twitter.
"(The explosion) knocked us all out of our bed, it was so strong", resident Mark Brady told KPRC.
Around 4:27amCT this morning, an explosion on Houston's northwest side, ~15 miles to my northwest, woke me up because it sounded like a person jumped on my roof & scurried away.
No evacuations were immediately ordered, Harris County Sheriff Ed Gonzalez said on Twitter around 6 a.m. CT.
Two people suffered non-life-threatening injuries, he said.