Severe storms sweeping through Pennsylvania have downed trees and power lines, causing some damage to buildings, but no serious injuries have been reported.

The National Weather Service in Pittsburgh says investigators will be heading to several western Pennsylvania counties to examine damage to determine whether tornados may have touched down.

Meteorologist Brad Rehak said radar indicated Monday afternoon that tornados may have touched down in Butler, Clarion and Forest counties, but many of the areas are so sparsely populated no one may have seen them.

Forecasters say there have been widespread reports of trees and wires toppled, with a few reports of trees falling into houses, causing some structural damage. Large hail and flooding has also been reported in some areas.

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