The Los Alamos National Laboratory in the New Mexico town of the same name will be spared from a fire raging in the vicinity, the Los Alamos fire chief told CNN Wednesday.

"We feel very comfortable that material is secure," Chief Doug Tucker said.

Concerns were raised that the wildfire could put at risk waste or other toxic materials stored at the lab.

But Tucker said that the waste, which is stored in drums, are kept on a blacktop with no vegetation around and are safe from fire. In case the fire was to close in, firefighters were ready to use foam to ensure that nothing would be released into the environment, he said.

Wednesday's weather appeared favorable to their work fighting the blaze, he said.

The Los Alamos lab, near Sante Fe, New Mexico, will remain closed through at least Thursday, officials said.