SANTA FE, Texas (Reuters) - The teen accused of killing 10 people in a mass shooting at his Texas high school on Friday was described by fellow students as a quiet loner who played football but kept to himself and was reportedly the victim of some bullying.

The suspect, identified as 17-year-old Dimitrios Pagourtzis, was a junior at Santa Fe High School near Houston. Classmates remembered he often wore a trench coat, similar to the garment authorities said the assailant used to conceal the two firearms he carried into the school.

Texas Governor Greg Abbott told reporters the gunman was armed with a shotgun and a .38 revolver, both of which he had taken from his father. It was not known if the father was aware his son had possession of the guns.

While Abbott said there were few advance warning signs that the suspect had violent tendencies, one ominous social media post was an image of a black T-shirt with the words "Born to Kill" found on the Pagourtzis' Facebook page.

The Dallas Morning News reported that the Facebook page also bore the image of a trench coat with Nazi insignia. The newspaper said classmates characterized Pagourtzis as unpopular and often the target of bullying.

"He was really quiet and wore like a trench coat every day," Santa Fe High student Mateo Twilley, 15, told CNN on Friday afternoon. Twilley said he had played football with the suspect.

Another student, who was not identified, told reporters in a local television news interview Pagourtzis "stuck to himself. He never really talked to other people."

The Houston Chronicle reported that a caption on the suspect's Instagram page said, "we all die sometime."

Pagourtzis was being held without bond Friday afternoon at the Galveston County Jail after being charged with capital murder, authorities said.

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(Reporting by Ernest Scheyder in Santa Fe, Texas; Additional reporting by Jon Herkovitz in Austin. Writing and additional reporting by Steve Gorman in Los Angeles; Editing by Bill Tarrant and Tom Brown)