Students have been evacuated

Ten people have been killed and 10 others injured in a high school shooting in Texas.

Officials say two suspects were detained - both believed to be students - following the attack in Santa Fe.

Explosive devices were also found by police in the school grounds and surrounding areas adjacent to the school.

One police officer was also shot during the incident, which began shortly after 8.00am local time.

People react outside the unification centre at the Alamo Gym, following a shooting at Santa Fe High School | Image: David J. Phillip/AP/Press Association Images

The state governor Greg Abbott has been speaking to reporters.

"One of the most heinous attacks that we've ever seen in the history of Texas schools.

"It's impossible to describe the magnitude of the evil of someone who would attack innocent children in a school".

In a statement earlier, school district officials said: "A horrific event occurred today at Santa Fe High School.

"At this time, the campus has been cleared, and the students have been relocated and are in the process of being reunited with their families.

"In this new operational investigation, we know that we have at least six that have been transported including one district police officer that we believe to have been a result of gunshot wounds.

"We have one suspect in custody and one suspect of interest."