And they're eager to catch this guy.
He is armed and his "aggressiveness toward the victims is rapidly increasing," police said in a release.
He has ordered employees onto the floor and threatened to kill them.
Investigators believe he may be responsible for 16 aggravated robberies in Fort Worth and surrounding cities since June.
He appears to target Metro PCS stores and check cashing businesses.
Follow this link to read the full report by Alex Branch.