Student Rome Shubert, who pitches on the school's baseball team and has already committed to playing for the University of Texas in the autumn, was injured in today's attack.

He told the Houston Chronicle that the bullet "missed everything vital".

"I was just scared for my life and my adrenaline was so high I had no idea I was shot," he said.

"I was sitting doing my work and he walked in, tossed something on the desks behind me," he told the paper "and then three loud pops and I jumped under my table and flipped it in front of me and I guess he ran out in the hall and I took off out the back door and when I was running I realised I was shot in the back of my head."