Firefighters were strengthening the containment line around the Crosby Fire in George H. Crosby Manitou State Park along the North Shore on Sunday. Minnesota Interagency Fire Center officials said that the fire, which was detected Wednesday, was caused by a lighting strike.

On Saturday, firefighters installed what they call a “hose lay” along the east side of the fire. The system lets firefighters pump water into the fire area and soak what are called “hot spots,” or heavy vegetation, stumps and downed logs that still hold heat.

Officials said Sunday that the fire grew from about 260 acres to 300 acres in the past day, but it’s also now 50 percent contained — 5 percent more than Saturday.

Leanne Langeberg, spokesperson for the Minnesota Interagency Fire Center, said about 32 Department

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