Witnesses are providing harrowing new details about the gunman who killed 10 and injured more than a dozen others at a Texas high school on Friday.

According to the New York Post, firsthand accounts from within Santa Fe High School indicated that 17-year-old suspect Dimitrios Pagourtzis shouted “Woo-hoo” as he gunned down students, faculty and staff.

He reportedly added abusive insults to the reign of bloodshed he imposed on his own school. The teen’s cellphone rang out with “a kamikaze song,” according to sophomore Kole Dixon.

The same Japanese military anthem reportedly played in a video posted to a Facebook page that has since been deleted.

“Another one bites the dust!” he allegedly sang during the deadly gunfire.

According to the mother of one student in the school, the gunman burst into a classroom after firing through a closet door.

With dead and dying on the floor in front of him, he reportedly teased them, asking if they were dead and referring to the cellphones that began ringing throughout the class.

“Do you think it’s for you?” he allegedly asked.

In addition to 10 fatalities, the massacre injured 13 people. As of Saturday morning, two of the victims remained in critical condition.

The suspect has reportedly confessed to the massacre, which lasted for about a half an hour. He is in custody awaiting charges of capital murder. A judge denied bond in the case.

Authorities say they are still interviewing individuals who might have information and have not ruled out the possibility that others were involved in plotting or executing the shooting.

[Featured image: Jennifer Reynolds/The Galveston County Daily News via AP]