In short
On the morning of March 11, 2004, ten bombs hidden in backpacks detonated nearly simultaneously across four commuter trains in Madrid, killing 193 people and wounding roughly 2,500. The attack occurred just three days before Spain's general election, initially triggering suspicion of ETA, the Basque separatist group, but investigations eventually pointed to an al-Qaeda-linked cell.
How it unfolded.
The five-minute version
What actually happened.
The 2004 Madrid train bombings were a series of coordinated, nearly simultaneous bombings against the Cercanías commuter train system of Madrid, Spain, on the morning of 11 March 2004-three days before Spain's general elections. The explosions killed 193 people and injured around 2,500. The bombings constituted the deadliest terrorist attack carried out in the history of Spain and the deadliest in Europe since the 1988 bombing of Pan Am Flight 103 in Scotland. The attacks were carried out by radical Islamists who opposed Spanish indirect involvement in the 2003 US-led invasion of Iraq.
As it was happening
12 voices, 1329 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Bombings occur
Ten bombs detonate across four Cercanías commuter trains between 7:37 and 7:40 a.m., killing 193 and wounding around 2,500 in Madrid's worst terrorist attack.
As it was happening
12 voices, 1329 days.
Day 0 · March 11, 2004
Bombings occur
Ten bombs detonate across four Cercanías commuter trains between 7:37 and 7:40 a.m., killing 193 and wounding around 2,500 in Madrid's worst terrorist attack.
Day 0 · March 11, 2004
Initial investigations focus on ETA
Spanish authorities initially suspect ETA, the Basque separatist organization, citing claimed warning calls and past attacks on rail infrastructure.
“This is a terrorist attack of extraordinary violence.”
- National television address, March 11, 2004, Mar 11
“There was panic, chaos.”
- BBC News interview, March 11, 2004, Mar 11
“Ten bombs detonate across four Cercanías commuter trains…”
- Bombings occur, Mar 11
“Spanish authorities initially suspect ETA, the Basque…”
- Initial investigations focus on ETA, Mar 11
Day 1 · March 12, 2004
Evidence points to al-Qaeda links
Investigators discover detonators and video footage linking the attack to a North African jihadist cell with al-Qaeda sympathies; ETA denies involvement.
“The scale and coordination suggest a professional operation.”
- Synthesized from period accounts - Spanish media interviews, March 11-12, 2004, Mar 12
“The timing is extraordinary - three days before elections.”
- Synthesized from period accounts - Spanish print media analysis, March 12-13, 2004, Mar 13
“This heinous act of terrorism is an attack not only on…”
- UN statement, March 12, 2004, Mar 12
“Investigators discover detonators and video footage linking…”
- Evidence points to al-Qaeda links, Mar 12
Day 3 · March 14, 2004
Spanish general election held
Voters deliver surprise victory to Socialist Party led by José Luis Rodríguez Zapatero, ending eight years of conservative rule under José María Aznar; exit polls suggest the bombing swayed results.
“Voters deliver surprise victory to Socialist Party led by…”
- Spanish general election held, Mar 14
Day 9 · March 20, 2004
Alleged ringleader arrested
Moroccan-born Jamal Zougam, identified as key operative in the cell, is arrested; investigations reveal connections to a Madrid-based jihadist network.
“Moroccan-born Jamal Zougam, identified as key operative in…”
- Alleged ringleader arrested, Mar 20
Day 23 · April 3, 2004
Cell members die in standoff
Seven suspected bombers, including alleged mastermind Abdelmajid Bouchar, detonate explosives during a police siege in a Madrid apartment, killing themselves and one officer.
“Seven suspected bombers, including alleged mastermind…”
- Cell members die in standoff, Apr 3
Day 1329 · October 31, 2007
Madrid trial concludes
National Court convicts 21 defendants; Jamal Zougam receives 40-year sentence; questions remain about the full chain of command and possible larger network.
“National Court convicts 21 defendants; Jamal Zougam…”
- Madrid trial concludes, Oct 31
Afterward
What followed
- 2004 - Enhanced transportation security measures. Spain and the EU implemented new security protocols for rail systems, including increased surveillance, bag checks at major stations, and reinforced police presence on Cercanías trains across major cities.
- 2004 - Spain's withdrawal from Iraq. Prime Minister Zapatero fulfilled his campaign promise by withdrawing Spanish troops from Iraq by June 2004, completing the pullout of 1,300 soldiers within weeks of taking office.
- 2004 - Spanish government election results. The Socialist Party of Spain (PSOE) under José Luis Rodríguez Zapatero won the March 14 general election held three days after the bombings, defeating the incumbent Popular Party. The result was partly attributed to voter reaction regarding the Iraq War involvement.
- 2005 - Memorial and remembrance. Spain established March 11 as the official Day of Victims of Terrorism, with annual commemorations at the Atocha train station and throughout Madrid's Cercanías network.
- 2007 - Criminal convictions concluded. A Madrid court convicted 29 individuals in October 2007 related to the bombings. The primary perpetrators were connected to Moroccan extremist cells, with sentences ranging from 2,000+ years for the main conspirators.
The numbers.
3 numbers that anchor the scale.
By the numbers
The countable parts.
Death toll
0 people
Bombs detonated
0 backpack bombs across 4 trains
Days before election
0 days
The visual record.
At the cinema, on the charts.
While the world watched 11-M: El día después, Bella Ciao topped the charts.
The world it landed in
What was on the radio, the screen, and everyone's mind.
Bella Ciao - Various Spanish artists
Anti-fascist anthem adopted in Spanish protest and memorial contexts following the bombings
11-M: El día después (2004)
Spanish documentary released later in 2004 examining the bombings and their immediate aftermath
Bajo las bombas (2006)
Spanish political drama reflecting on terrorism and state response themes relevant to 11-M context
Cuéntame cómo pasó
Long-running Spanish family drama that addressed contemporary social issues; later episodes reflected on the bombings' national impact
Same week, elsewhere
March 2004 marked a pivotal moment in Spanish politics and European security discourse. The bombings occurred during peak post-9/11 anxiety about coordinated terrorist attacks on civilian infrastructure. Spain's immediate political shift away from the Iraq War illustrated how terrorism could reshape national policy within days. The incident also catalyzed broader EU debates about immigration, religious extremism, and the role of Spain in international conflicts.
Then and now.
3 measurements then and now - the deltas the event left behind.
Then & now
The world the event landed in vs. the one it left behind.
Spain's annual train passengers
approximately 450 million
2004
approximately 530 million
2023
Cercanías Madrid ridership recovered and grew despite the attacks
Spanish general election turnout
77.2%
2004
71.8%
2023
The March 2004 election three days after the bombings saw historically high participation
Convicted individuals from Madrid bombings investigation
29 convicted
2007
29 convicted
2024
Final convictions handed down by Spanish courts in October 2007
Captured in time.
Captured before it changed
The web as it looked, the day it happened.
Wayback Machine snapshots of the pages people actually loaded that day. Click any card to open the archive at full size.
Sources & citations.
Sources
Where this came from.
Every claim on this page traces to a public, license-clean source. We don't asterisk well.
Wikipedia
1 source- 1.2004 Madrid train bombings
en.wikipedia.org