Update 3:35 p.m. April 11, 2014, with damage estimates.

A two-alarm fire heavily damaged two townhouses in a Mira Mesa residential complex Friday, leaving two firefighters with minor injuries and killing a dog.

The blaze in the 8800 block of Hillery Drive erupted for unknown reasons about noon, according to the San Diego Fire-Rescue Department.

It took crews roughly 35 minutes to subdue the flames, which spread from a two-story unit to a single-floor residence across a walkway, spokesman Lee Swanson said.

Medics took a firefighter to UCSD Medical Center in Hillcrest for treatment of a burn to his ear. Another crew member was evaluated at the scene for an injury to his right arm, Swanson said.

Emergency personnel found a dead dog on the second story of the townhouse where the fire originated. The structure, Swanson said, incurred $300,000 in damages, while the damaged contents were worth $100,000.

– City News Service