Incident Summary:

"09/15/2017: An explosive device detonated on a London Underground train at the Parsons Green station in London, United Kingdom. At least 29 people were injured in the blast. The Islamic State of Iraq and the Levant (ISIL) claimed responsibility for the incident. The assailant, identified as Ahmed Hassan, stated that he had previously been "trained to kill" by the group, but Hassan later revoked this claim."



United Kingdom

Western Europe

region/u.s. state:



Location Details:
The incident occurred near the Parsons Green Station in southwest London.

Attack Information
Type of Attack (more) Bombing/Explosion
Successful Attack? (more) Yes
Target Information (more)
Target Type: Transportation
Name of Entity London Underground Limited
Specific Description Train
Nationality of Target Great Britain
Additional Information
Hostages No
Property Damage Yes
Extent of Property Damage Minor (likely < $1 million)
Value of Property Damage Unknown
Weapon Information
Type Sub-type
Explosives/Bombs/Dynamite Other Explosive Type
Weapon Details
A homemade explosive device containing triacetone triperoxide (TATP) and 2.2 kilograms of sockets, screws, bolts, nails, knives, and screwdrivers as shrapnel, hidden inside a plastic bucket, and planted inside a shopping bag 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
Additional Information Casualty numbers conflict across sources. Following GTD protocol, the majority reliable estimates are reported here.
Perpetrator Group Information
Group Name Claimed Responsibility
Islamic State of Iraq and the Levant (ISIL) (suspected) Yes (Confirmed: Unknown; Mode: Posted to website, blog, etc.)
Perpetrator Statistics
Number of Perpetrators 1
Number of Captured Perpetrators 1
Casualty Information
Total Number of Casualties 0 Fatalities / 29 Injured
Total Number of Fatalities 0
Number of U.S. Fatalities 0
Number of Perpetrator Fatalities 0
Total Number of Injured 29
Number of U.S. Injured 0
Number of Perpetrators Injured 0
"London subway explosion investigated as terror plot; ISIS takes credit for train bombing that injured 29; threat level raised," The Boston Globe, September 16, 2017."
"ISIS claims responsibility for London subway attack," New York Post, September 15, 2017."
"British Police Charge 18-Year-Old With London Subway Bombing," Radio Free Europe, September 22, 2017."