| Clue | Source | Date |
|---|---|---|
| Carefully monitored fire utilized in prairie restoration | USA Today | 10 Apr 2026 |
| Firefighter's term for a carefully measured dig? | Wall Street Journal | 17 May 2025 |
| A team of fire experts might set one | USA Today | 14 Mar 2020 |
| Fire that's intentionally set | USA Today | 15 Nov 2019 |