The NCTC Seal
2014 NCTC Counterterrorism Calendar The NCTC Seal


Bomb Threat Stand-Off Distances

This table is for general emergency planning only. A given building's vulnerability to explosions depends on its construction and composition. The data in these tables may not accurately reflect these variables. Some
risk will remain for any persons closer than the Outdoor Evacuation Distance.

  Explosives Capacity1
(TNT Equivalent)
Mandatory Evacuation Distance2 Preferred Evacuation Distance3
pipe bomb
Pipe bomb
5 LBS/
2.3 KG
70 FT/
21 M
1,200 FT/
366 M
Suicide Vest
Suicide vest
20 LBS/
9.2 KG
110 FT/
34 M
1,750 FT/
518 M
Briefcase bomb
Briefcase/suitcase bomb
50 LBS/
23 KG
150 FT/
46 M
1,850 FT/
564 M
500 LBS/
227 KG
320 FT/
98 M
1,900 FT/
580 M
1,000 LBS/
454 KG
400 FT/
122 M
2,400 FT/
732 M
Small Delivery Truck
Small delivery truck
4,000 LBS/
1,814 KG
640 FT/
195 M
3,800 FT/
1159 M
Container or Water Truck
Container/water truck
10,000 LBS/
4,536 KG
860 FT/
263 M
5,100 FT/
1,555 M
60,000 LBS/
27,216 KG
1,570 FT/
479 M
9,300 FT/
2,835 M
Graphic of evacuation distances
1Based on maximum volume or weight of explosive (TNT equivalent) that could reasonably fit in a suitcase or vehicle.

2Governed by the ability of typical US commercial construction to resist severe damage or collapse following a blast. Performances can vary significantly, however, and buildings should be analyzed by qualified parties when possible.

3Governed by the greater of fragment throw distance or glass breakage/falling glass hazard distance. Note that pipe and briefcase bombs assume cased charges that throw fragments farther than vehicle bombs.

4A known terrorist tactic is to attract bystanders to windows, doorways, and the outside with gunfire, small bombs, or other methods and then detonate a larger, more destructive device, significantly increasing human casualties.
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