Authorities say possible explosive devices have been found at and adjacent to the Texas high school where a shooting left as many as 10 people dead.
The Santa Fe Independent School District said in a statement Friday that authorities are in the process of rendering the devices safe.
There's no indication how many devices have been found. Police asked the public to "remain vigilant" and to call 911 if they see any suspicious items in the area.
Ten people were killed and another 10 injured when a student opened fire Friday at a high school in Texas, the state's governor said.
"It's with a very heavy heart that I can confirm that as of this time, there have been 10 lives that have been lost, and another 10 that have been wounded," Governor Greg Abbott told a news conference.
The school outside Houston went on lockdown around 8 am after an active shooting was reported.
Earlier, Harris County Sheriff Ed Gonzalez says there "could be 8 to 10 fatalities" from the shooting. Gonzalez says the majority of the dead are students.
The sheriff says one person is in custody and a second person has been detained.
"School shooting in Texas. Early reports not looking good. God bless all!" Trump tweeted.
CNN reported "multiple fatalities," citing unnamed sources.
"The situation is active, but has been contained," the Santa Fe Independent School District said in a statement posted to Facebook.
One patient had been transported to the University of Texas Medical Branch at Galveston, according to a spokesman, Raul Reyes. At least one more was in a helicopter en route to the hospital as of midmorning, he said.
The district said law enforcement agencies were securing the building and that students were being transported to the nearby Alamo Gym, at 13306 Highway 6, where parents could meet them.
Santa Fe is 20 miles west of Galveston, in Galveston County.
Leila Butler, a sophomore at the school, told ABC13, a local affiliate, that fire alarms at the school went off at about 7:45 am.
Another student told the station that a gunman entered her art class with what looked like a shotgun and began shooting at students. She said she saw a student get hit in the leg before she and others started running.
The Santa Fe Police Department, Harris County Sheriff's Office, Galveston County Sheriff and Bureau of Alcohol, Tobacco, Firearms and Explosives all said they were assisting in the response.
"Large police presence, please avoid the area," Ed Gonzalez, the sheriff in neighboring Harris County, said on Twitter.
