Arizona Wildfire Near Kitt Peak Observatory 40% Contained

Kitt Peak National Observatory in Tucson.

Photographer: Joe Sohm/Visions of America/Universal Images Group Editorial/Getty IMages

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Tucson, Ariz. (AP) -- A lightning-caused wildfire that led to an evacuation of the Kitt Peak National Observatory southwest of Tucson is 40% contained, authorities said.

More than 300 firefighters were working the wildfire Saturday. If all goes as planned, authorities said the blaze could be fully contained by next Sunday.