Zionsville firefighters had a busy Tuesday night, battling two separate house fires caused by lightening strikes. The first took place in the 9400 block of Greenthread Drive about 10:45 p.m. and caused an estimated $100,000 or more in damages. The second blaze was reported an hour later in the 3500 block of Flagstone Drive. Damages in the small attic fire were estimated at $7,500. No injuries were reported in either fire.