Jul. 7--CUDAHY -- A small cloud of smoke wafted over the Patrick Cudahy plant on Tuesday as firefighters battling the blaze for a second day focused their efforts on two key hot spots.

"The situation is not over yet," Fire Chief Dan Mayer said at a late morning news conference at Cudahy City Hall. "We have not declared the fire under control yet, though it is contained. We have two hot spots. They're not worrying me. We're working on them. We're not declaring it under control until those two hot spots are under control."

About 60 firefighters are still working the scene at the Patrick Cudahy plant, where a fire has been burning since late Sunday and continued to smolder under collapsed areas of the meatpacking plant.

No one has been injured.

Mayer said ammonia units that caused concern for authorities on Monday -- forcing the evacuation of residents and businesses within a one-mile radius of the plant -- are all contained and out of danger.

The cause of the fire and damage to the plant are not yet known. Mayer said Cudahy police will be working with the state fire marshal and the Bureau of Alcohol, Tobacco, Firearms and Explosives to investigate the fire.

He said fire damaged primarily a so-called microwave area where the company prepares bacon. Also burned was a section above an employee locker room.

"There is a section that is the heart of the building," he said. "Without that section, they would have a difficult time getting back into production. We were able to save that part of the building."

Mayer said the plant undergoes fire inspection twice per year and there was nothing in the past that signaled any particular problems related to the fire.

"Patrick Cudahy has been very diligent in code compliance," he said. "They've invested a great deal of money to make their facility safe. That investment probably prevented a major catastrophe. They're very proactive in maintaining their fire safety. They're very responsive to our needs and worked very closely with us."

He said firewalls within the facility helped to contain fire in the building.

"If there weren't firewalls in that building, that entire building would be gone," he said.

Mayer praised the work of the 130 firefighters from Cudahy and 26 other departments who fought the blaze as well as police, health department, water department and public works employees responsible for other duties related to the fire.

Mayor Ryan McCue said, "I want to thank all the employees of the City of Cudahy. They came in and worked hard. They knew what their jobs were.