Police charged a North Carolina man Wednesday with the murderof three Muslim students, but any motive for the shooting wasn’t immediately clear.

The shooting occurred about 5 p.m. on Tuesday, when police responded to gunfire and found the three victims dead in their apartment in Chapel Hill. All three were shot in the head, WRAL reports. The suspect Craig Stephen Hicks, 46, described himself online as an “anti-theist,” according to a local ABC affiliate. Police said he turned himself in and has been charged with three counts of first-degree murder.

The victims were identified as Deah Shaddy Barakat, 23, and his wife Yusor Abu-Salha, 21, and Abu-Salha’s sister, Razan Abu-Salha, 19, of Raleigh, the Charlotte Observer reports.

Barakat was a second-year dental student at UNC-Chapel Hill’s School of Dentistry. He was an advocate for global dental health and planned to travel to Turkey this summer to treat…