When Algae in Homes Causes Alarm, ‘We’re In Trouble’

The California Department of Health is investigating after residents at a house in San Diego reported hearing a thud in the night.

The sound, which sounded like a crunching of a tire, was felt throughout the home, according to the health department.

The agency said the sound came from a cement slab inside the garage.

The contractor who built the garage was notified of the problem by a homeowner, and the slab is now being inspected.

No injuries have been reported.