Mayor Bill de Blasio has toured the remnants of a Brooklyn warehouse that was engulfed by a massive fire.

The fire at the Williamsburg warehouse ignited Saturday. It was still smoldering in spots Thursday morning when de Blasio visited.

The building housed paper records for several city agencies, including the Health Department and the Health and Hospitals Corporation.

De Blasio toured the site and thanked firefighters for their work, which was complicated by freezing temperatures.

Some water used to battle the blaze froze, leaving several cars and fire hydrants encased by ice.

No one died in the seven-alarm fire. The cause remains under investigation.

(AP)