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13APR

Karaj bridge toll rises to thirteen

2 min read
17:09UTC

The US struck an unfinished highway bridge during Iran's most beloved outdoor holiday. Thirteen are dead, 95 wounded, and the toll may still rise.

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TechnologyAssessed
Key takeaway

Thirteen killed at an unfinished bridge on a national holiday gives Tehran its strongest moral argument.

The death toll from the US strike on the B1 highway bridge in Karaj, Alborz province, has risen from 8 to 13, with 95 wounded . The bridge was struck during Sizdah Bedar (Nature Day), the 13th and final day of Nowruz, Iran's most significant outdoor holiday. Thousands of families gather near parks and waterways on Sizdah Bedar. The bridge, still under construction and not yet open to traffic, had no claimed military use. 1

Iran's Foreign Minister Abbas Araghchi said "striking civilian structures including unfinished bridges will not compel Iranians to surrender." Trump posted video of the collapse on Truth Social, calling it "Iran's biggest bridge."

The B1 strike on a national holiday, killing civilians at a gathering with no military nexus, is the clearest case of civilian harm in the campaign to date. The toll may continue to rise.

Deep Analysis

In plain English

Sizdah Bedar is the last day of Iran's spring new year festival. Millions of families go outdoors to parks and riversides. The US struck a bridge in Karaj while people were near it for this holiday. The bridge was still under construction and not yet open to traffic. Thirteen people died. Iran's foreign minister said the strike proved the US was targeting civilians. Trump posted video of the bridge collapsing on Truth Social.

Deep Analysis
Root Causes

CENTCOM's targeting framework designates infrastructure used by military logistics as a legitimate dual-use target under IHL. The B1 bridge was described as a supply route to drone and missile units.

The timing on Sizdah Bedar was either a failure of cultural intelligence, a deliberate signal, or operational indifference. Trump's Truth Social post celebrating the collapse rules out the possibility that the civilian context was weighed as a proportionality factor in target selection.

What could happen next?
  • Consequence

    The Sizdah Bedar timing and Trump's celebratory social media post provide Iran with its strongest propaganda asset of the conflict, directly useful in UN and allied diplomacy.

  • Risk

    The UN Fact-Finding Mission's existing warning about conduct potentially amounting to crimes against humanity will be reinvigorated by this incident. European political pressure on the US will increase.

Sources:Washington Post / Iranian state media·Washington Post / Iranian state media·CNBC / Al Jazeera / NPR
Mentions:Iran →Karaj →Israel →Lebanon →International humanitarian law →Truth Social →Alborz →Prima →ICRC →Baghdad →Nowruz →Abbas Araghchi →B1 highway bridge →Donald Trump →Sizdah Bedar →CENTCOM (US Central Command) →
First Reported In

Update #58 · First US aircraft fall over Iran

Washington Post / Iranian state media· 4 Apr 2026
Read original →
Causes and effects
Caused by
US Strikes Civilian Bridge; Eight Commuters Killed
The US strike on the B1 bridge on 3 April is the event whose toll rose from 8 to 13 dead in this update.
Occurred 3 Apr 2026
Read story →
This Event
Karaj bridge toll rises to thirteen
Striking civilian infrastructure during Sizdah Bedar, with no military nexus, is the clearest case of civilian harm in the campaign.
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