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Two men were arrested and charged Tuesday after police found remnants of a methamphetamine lab inside an Iowa Taco Bell, police said.

Cedar Rapids police received calls of a suspicious person outside the fast food restaurant around 4:42 a.m. (5:42 a.m. ET) Tuesday. The arriving officers found two men outside, including one Taco Bell employee.

A manager who let police into the closed restaurant found signs of a meth lab in a utility area.

Christopher Adam Matous, 31, was charged with conspiracy to manufacture methamphetamine and several chemical possession charges. Kent Jerome Duby, 56, was also charged with conspiracy to manufacture meth.

Taco Bell said the employee was fired and the franchisee was cooperating with the police investigation.

"Both we and our franchisee find this completely unacceptable," Taco Bell said in a statement. "Although the suspicious items found in the restaurant were not used in the kitchen, the employee has been terminated and our franchisee is considering pressing criminal charges.

"The restaurant will reopen after it has been sanitized and inspected by the Health Department," the company said.