FREMONT – Police and firefighters responded to a Fremont home Tuesday morning following an explosion that may be linked to a drug lab.

Around 9:30 a.m., authorities were called to a residence on the 37000 block of Waverly Terrace. Police said the occupants had left the scene before first responders arrived.

Authorities evacuated several adjoining units. An initial investigation determined that a potential drug lab was inside the residence.

Police said Tuesday afternoon that one person later checked into a hospital and is in critical condition.

As of about 3:45 p.m., detectives remained at the scene. Residents should expect police, fire and cleanup crews in the area.