An early morning fire at a small Lago Vista fourplex damaged four units and displaced at least eight residents, an official said Tuesday.

The fire broke out shortly before 6 a.m. at 20702 Bonanza Street on the top two units of a fourplex, said Chief Raymond Tennison for the North Lake Travis Fire and Rescue Department, otherwise known as Emergency Services District No. 1.

Emergency crews found the fire fully involved on the top two units but were able to extinguish it quickly, he said. The two apartments were destroyed, while the bottom two apartments suffered extensive water and smoke damage, Tennison said.

All of the occupants of the apartments were out of their homes when crews arrived, and no one was injured, he said.

The cause and an estimate of the extent of damage was not available but is being investigated, Tennison said.

Tennison estimated that at least eight to 10 residents have been displaced.