Students who had classes in the area of the shooting were the first allowed back in, followed by the rest about two hours later.

The social media campaign comes days after 10 people, mostly students, were killed when a gunman opened fire inside Santa Fe High School in Texas.

Dimitrios Pagourtzis is being held in the Galveston County jail on capital murder charges.

Texas has more than 1.2 million licensed handgun owners who can openly carry their weapons in public. The state hosted the NRA’s annual meeting two weeks ago.

The 63-year-old substitute teacher, Cynthia Tisdale, was killed in a shooting at Santa Fe High School.

Retired Lt. Col. Oliver North says the disease isn't the Second Amendment and that depriving law-abiding citizens of their constitutional right to have a firearm won't stop shootings.

Texas Lt. Gov. Dan Patrick called Sunday for a "hardening" of the nation's school buildings in the wake of the attack by a 17-year-old student who killed 10 people at a high school near Houston.

"We are still in a state of denial. We can't believe it. It's like a nightmare," said the father of Sabika Sheikh, 17, who was killed in the Santa Fe school shooting.

The family of Dimitrios Pagourtzis say they are "shocked and confused" by the teenager's alleged involvement in the massacre of 10 people at a high school in Santa Fe, Texas on Friday.

Authorities have released the names of the 10 people who were killed in the mass shooting at a Texas high school.