Incident Summary:

03/31/2011: On Thursday morning at 0745, in Olten, Solothurn, Switzerland, a letter bomb detonated at the office of Swissnuclear. The device detonated as a female employee was handling the parcel on the fourth floor. Two people were injured and it is unknown if the attack caused any property damage. No group claimed responsibility for the attack, although the Informal Anarchist Federation was thought to be responsible.




Western Europe

region/u.s. state:



Location Details:
The attack took place in Olten, Solothurn.

Attack Information
Type of Attack (more) Bombing/Explosion
Successful Attack? (more) Yes
Target Information (more)
Target Type: Business
Name of Entity Swissnuclear
Specific Description The office of Swissnuclear was targeted in the attack.
Nationality of Target Switzerland
Additional Information
Hostages No
Ransom No
Property Damage Unknown
Extent of Property Damage Unknown
Value of Property Damage Unknown
Weapon Information
Type Sub-type
Explosives Letter Bomb
Weapon Details
A letter bomb was used in the attack.
Additional Information
Suicide Attack?No
Part of Multiple Incident?No
Criterion 1 (more) Yes
Criterion 2 (more) Yes
Criterion 3 (more) Yes
Doubt Terrorism Proper (more) No
Perpetrator Group Information
Group Name Claimed Responsibility
Informal Anarchist Federation (suspected) Yes (Confirmed: Unknown; Mode: Unknown)
Perpetrator Statistics
Number of Perpetrators Unknown
Number of Captured Perpetrators 0
Casualty Information
Total Number of Casualties 0 Fatalities / 2 Injured
Total Number of Fatalities 0
Number of U.S. Fatalities 0
Number of Perpetrator Fatalities 0
Total Number of Injured 2
Number of U.S. Injured 0
Number of Perpetrators Injured 0
Gaia Pianigiani, "Three Mail Bombs Explode in Europe, Injuring Three," New York Times, March 31, 2011,
Xinhua News Agency, "Two Injured in Mail Bomb Blast in Switzerland," Xinhua News Agency, March 31, 2011,
Nick Cumming-Bruce, "Letter Bomb Injures Two at Swiss Nuclear Office," New York Times, March 31, 2011,