unidentified trace in the sky

It was on early March when I took the photo and I still cannot shake off the image I saw that day from my mind. That day I left work earlier than usual and after I made a turn to "Noboribetsu Ohashi" for a wider view, I saw the line falling down from the sky which extremely scared me. It looked like airplane track but if so the speed was quite fast and it was falling!! My heart started beating hard and I drove quite fast trying to catch up with the trace.

However it was too fast for me!!

It was surely the track something was shooting down, but what on earth was that???
I lost it when I got off the car, it was hidden in the crowd. Nothing was mentioned on the news nor anybody mentioned...hmmm.....can anybody please explain?