Gunman blasted through door, lingered for almost 30 minutes

Stuart Villanueva/The Galveston County Daily News via AP

Lucrecia Martinez, 7, and her brother, Luciano, 9, of Dickinson light candles during a vigil Friday hosted in the wake of a deadly school shooting at Santa Fe High School in Santa Fe, Texas.

SANTA FE, Texas — The suspect in the Texas school shooting began his attack by firing a shotgun blast through an art classroom door, sending panicked students to the entryway to block him from getting inside, witnesses said Saturday.