That is a tragic story! It sounds like it is glass embedded strings meant for fighting kites that have been intentionally strung across roadways at neck level that caused the injuries. The article said that charges have been filed against the perpetrators.
Different story from the lede story here maybe. This sounds like careless kite flyers who left pieces of this sharp string behind entangled in tree branches or wires over a roadway, and did not mention anybody actually being accused.
There have been deliberate booby traps heard of in the US where someone strings picture wire over a street. It has maimed and killed motorcycle riders and damaged cars.