State game officials are trying to figure out what could have killed a large number of birds that were found lying along a highway in eastern Pennsylvania.

The Reading Eagle newspaper said witnesses reported 50 to 100 dead birds Sunday along Route 222 in Spring Township near Reading.

The Pennsylvania Game Commission is investigating. It is believed the birds are European starlings.

Harry Brown of the Animal Rescue League of Berks County said it’s unlikely that an illness like West Nile virus would kill that many birds in such a small area. But he said a tractor-trailer could be to blame.

Brown said birds are sometimes caught in the crosswind created by one rig, then struck by another.

In recent months, there have been several cases worldwide of mass bird deaths.

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