A second person was reportedly brought into custody in connection with a school shooting in Texas Friday that left at least 10 people dead.

CNN reported that a law enforcement official said they’ve arrested an 18-year-old man who could’ve acted as shooting suspect Dimitrios Pagourtzis’ accomplice in Friday’s incident at Santa Fe High School. Law enforcement noted that the accomplice is not believed to have participated in the shooting. Additional details about the alleged accomplice were not made immediately available.

Texas Governor Greg Abbott said police were interviewing two other people identified as persons of interest. It’s unclear whether one of those persons of interest was the accomplice suspected to be involved in the deadly shooting.

“One is a person who was at the scene,” Abbott said, according to USA Today. “We cannot definitively say whether or not that this is a person that may have had some level of involvement in the crime. There was just some suspicious reactions from this particular person and we want to make sure this person is adequately investigated. Separate from that, there is another person where we have certain information [and] we want to make sure that this other person is going to be fully interviewed to see if there is information to be gleaned.”

In addition to explosives, Pagourtzis, 17, is believed to have used his father’s shotgun and a .38 revolver during Friday’s shooting. Mentioning a CO2 device and a Molotov cocktail, Abbott said the explosives appeared to have been assembled by Pagourtzis and that there’s no evidence indicating he received any assistance in making them.

Meanwhile, Galveston County prosecutors recently confirmed that Pagourtzis has been charged with capital murder and aggravated assault of a peace officer.

[Featured image: Steve Gonzales/Houston Chronicle via AP]