"It never crossed my mind that there would be a shooting there, in Clarendon," Evans said. "An employee went to the backroom, and then we heard a woman's scream. I didn't wait to find out what happened."

Evans said customers "weren't panicky" but quickly made their way to the front door.

The glass-paneled shop was cordoned off with crime-scene tape by midafternoon. A handful of Apple employees paced back and forth and sat on benches, checking their iPhones for updates about their colleague's condition.