LIVE: Police report 'multiple victims' in Texas school shooting

Police are reporting "multiple victims" in a school shooting Wednesday morning in Arlington, Texas.

"The Mansfield Independent School District said in a news release that Timberview High School was on lockdown Wednesday morning," the Associated Press reported. "The district said that students and staff were locked in the classrooms or offices. The report came just days after a shooting at a Houston charter school that injured an administrator."

Maria Guerrero of Dallas' NBC affiliate reported on Twitter that, "Arlington police confirm 'multiple victims' in shooting at Mansfield Timberview HS."

Another Texas journalist shared a video from inside a classroom at the school, as shots rang out and students scrambled. The video reportedly was sent to a parent by her daughter via text message.

Texas law enforcement officials said that four people were injured during the shooting, which occurred amid a fight at the school. Police identified the shooting suspect as 18-year-old Timothy George Simpkins.

Watch a livestream from CBS News below.

LIVE: Texas high school on lockdown amid police investigation | CBSN