Update (5:00 pm ET): Authorities have identified the shooter as Emanuel  Kidega Samson, 25, of Murfreesboro. Little is known about Samson or his motivation – other than that he is a black male, and that he wore a clown mask during the assault, before turning his gun on himself. According to theWashington Times, Samson has been discharged from the hospital and will soon be charged with murder and attempting murder for the attack, police said.

Samson is reportedly a Sudanese immigrant. Screenshots of his Facebook profile have been circulating on Twitter:

And here’s what’s purportedly his Instagram page: