DENVER (AP) -- Denver police are investigating three robberies in three weeks of tow truck drivers.

Junk car dealer Tim Rohac says he buys cars and he was robbed Sunday when he went to a house where someone said they had a car for sale.

He says he was pistol-whipped and the two robbers took about $900 in cash.
Police tell KUSA-TV (http://on9news.tv/zT1iGH ) there were two other tow-truck robberies in January.
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