Lubbock Police responded to the report of a robbery at 50th and Avenue Q at about 9:30 Thursday morning. 

Police said a suspect demanded money from a man at a set of gas pumps.  The man said no.  Police said the suspect then pulled a knife and demanded money again.  And again, the man said no. 

The suspect then left, according to police.  A witness called police, but the man who was targeted for the robbery left.  Police found someone matching the suspect description, and he was arrested for a previous warrant.  

Police are asking the man who was targeted for robbery to come forward and identity the suspect.  Anyone who knows something about the case is asked to call Crime Line at 806-741-1000.