Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Location | Nature of incident | Circumstances | Casualties |
| --- | --- | --- | --- | --- |
| 2007-05-19 | Kunduz | Hostile | Suicide bomber attack | 3 KIA, 5 WIA |
| 2007-08-15 | Road to Jalalabad | Hostile | IED | 3 KIA, 1 WIA |
| 2007-08-31 | Kabul | Hostile | Suicide bomber attack | 2 WIA |
| 2007-09-08 | Mazar-i-Sharif | Non-hostile | Suicide | 1 killed |
| 2007-10-05 | Kunduz | Hostile | Suicide bomber attack | 3 WIA |
Question:
What was the circumstance that happened on the road to Jalalabad?
Answer:
IED