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Dallas police said a man robbed a teenager who was suffering a seizure.
Frank White, 33, took a wallet from 18-year-old Mississippi State University ROTC student Andrew Bow.
The incident happened at a downtown Greyhound bus station just before midnight on Tuesday, investigators said.
Surveillance video, which captured the robbery, shows a man approaching Bow, who was wearing desert fatigues and flailing on the sidewalk. The man then pulls a wallet from the Bow's back pocket.
Police have charged White with theft. He has a history of criminal trespassing.
It was not clear what caused the Bow's seizure.