A 27-year-old man shot and killed his roommate, then fatally shot himself inside their Oakton apartment Wednesday night, a Fairfax County police spokesman said.

Officers were called to the 3000 block of Trevor House Drive and found Ihab Robert Qutob, 43, dead in in his home about 7 p.m., said Master Patrol Officer Eddy Azcarate. Police also found Alexander A. Rios, 27, fatally wounded and took him to a hospital where he later died, Azcarate said.

Investigators believe Rios shot Qutob with a handgun before turning the gun on himself. Police recovered a handgun at the scene.

Officials did not know what sparked the violence and continue to investigate, Azcarate said.