Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When was the location 15km NW of Pol-E Khomri, the circumstaances IED and the casualties of 1 WIA?

### Inputs:
table_name: table, columns: ['Date', 'Location', 'Nature of incident', 'Circumstances', 'Casualties']

### Response:
SELECT Date FROM table WHERE Casualties = 1 wia AND Circumstances = ied AND Location = 15km nw of pol-e khomri