Horrifying security footage shows the moment an armed assailant targeted and accosted a 53-year-old grandmother at gunpoint outside her Houston home, for $3,900 in cash.The video, recorded on 7:35am on March 26, shows the masked mugger rushing out of the passenger side of a black sedan that pulled up to Tonya Robertson's home as she arrived home from a night-shift. 'Quick, quick, come here. Come here!' the hooded robber can be heard shouting in the heart-pounding clip, as he sprints toward Robertson pointing a gun at her.
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