I think it may have come from the open land between Tyson and Dunoon Roads. It's an unusual time for that sort of thing to happen - kids messing about with fireworks usually do so in the evening, not 6AM in the morning. It's annoying, but it's nowhere near as bad as it was before new restrictions on the sale of fireworks were introduced about 3-4 years ago. It used to happen on a regular basis from October through to January.