The tower “seeing sparks” indicates to me either the plane had an engine failure, or the flaps weren’t set for takeoff, and the pilot drug the tail on the runway trying to get it into the air. Can’t really tell for sure from the picture at the source, but the wing flaps on the left wing don’t look like they’re extended at all.
}:-)4
I noticed that too; hard to tell...
There are additional pictures at http://www.wistv.com/Global/category.asp?C=127802.
Maybe a blown tire.