Authorities are maintaining a 200-foot perimeter around the sinkhole while it is still active, according to Pasco County officials. No one was home at the time, the owners had already gone to work.
The Pasco County fire chief says it grew in a matter of minutes. Authorities say one home on Ocean Pines Drive was completely destroyed and another is 50 to 60 percent damaged.
The neighborhood uses septic tanks, not a sewer system - a worry since the sinkhole might grow so large it connects to a nearby lake, Guthrie said. Smaller holes are common, though they have been known to damage and even destroy entire homes.
The Tampa Bay Times reports Duke Energy has cut power to about 100 homes in the neighborhood.
Sheriff Chris Nocco said it's impossible to say when the sinkhole will stop expanding.
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At that time the hole was the size of a swimming pool, and was quickly growing.
Guthrie said that the question of safety was under control and, although it had been a frightening experience for residents, it was now a question of trying to conserve property. "This is Mother Nature and we don't know where it's going to go".
The sinkhole is threatening other homes in the area.
The American Red Cross is helping displaced families.
Evacuations continued and increased to ten homes.