Fire crews were called to a construction site in southeast Edmonton early Tuesday morning.
The call came in just before 4:45 a.m.
The blaze destroyed two houses under construction, along with a duplex, near 30th Avenue Northwest and Fourth Street.
The area is a new neighbourhood just off the Anthony Henday, called Maple Crest.
The cause of the fire is not yet known. No injuries were reported.
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Fire crews and ATCO were on scene Tuesday morning.