A male student opened fire at a suburban Indianapolis middle school Friday morning, wounding another student and a teacher before being taken into custody, authorities said.

The attack at Noblesville West Middle School happened around 9 a.m., police Chief Kevin Jowitt said at a news conference. He said investigators believe the suspect acted alone, though he didn't release the boy's name or the names of the victims, who were taken to hospitals in Indianapolis.

Law enforcement is responding to the school, about 20 miles northeast of Indianapolis.

 CBS affiliate WTTV reports the injured student is a 13-year-old girl. Another student suffered a broken ankle, the station reports.

The families of the victims have been notified. 

Indiana University Health spokeswoman Danielle Sirilla said the teacher was taken to IU Health Methodist Hospital and the wounded student was taken to Riley Hospital for Children. She didn't know the seriousness of their injuries.  

Noblesville police also responded to a report of a threat at the nearby high school, but Noblesville police say they don't believe it to be anything other than a "communicated threat." The school was later given the all clear. Indiana State Police Cpt. David Bursten told the station they have the means to track down the call, and that person will be arrested and prosecuted.  

The Noblesville police and fire departments were responding and the school has been evacuated.

After the attack, students were bused to the Noblesville High School gym, where their families could retrieve them.

Erica Higgins, who was among the worried parents who rushed to get their kids, told WTHR-TV that she learned of the shooting from a relative who called her at home.

"I just want to get my arms around my boy," she said.

Higgins said her son was shaken up but knew little about what happened.

"I got a 'Mom, I'm scared' text message and other than that, it was 'come get me at the high school,'" Higgins said.

Gov. Eric Holcomb, who was returning from a trip to Europe on Friday, issued a statement saying he and other state leaders were getting updates about the situation and that 100 state police officers had been made available to work with local law enforcement.

"Our thoughts are with all those affected by this horrible situation," Holcomb said.

Noblesville is home to about 50,000 people. The middle school has about 1,300 students from grades 6-8. The school's academic year was scheduled to end next Friday.

The shooting comes a week after the deadly rampage at Santa Fe High School in Texas that left 10 dead and more than a dozen others injured. 

In a statement obtained by WTTV, Indiana Attorney General Curtis Hill said the "epidemic of violence sweeping across American schools has now come to Indiana."

"While we await additional information on the school incident in Noblesville this morning, we must brace ourselves for the reality that our schools and our children are under siege by an unspeakable wave of terror that is taking full advantage of our open and free society."