Officials say a survey team found extensive damage in the Midway Manor section of Allentown.
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The strength of the twister and its exact path are still unknown.
More details are expected to be released by Wednesday morning.
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A survey team was also out in Delaware County and New Castle County, Delaware on Tuesday, but officials say that storm damage was caused by straight-line winds.
SEE ALSO: National Weather Service says straight-line winds caused storm damage in Delaware
National Weather Service: Straight-line winds caused Delaware damage