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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Tunis floods: our verification — Verify</title>
  <link rel="preconnect" href="https://fonts.googleapis.com" />
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
  <link href="https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700;800&family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet" />
  <script src="https://cdn.tailwindcss.com"></script>
  <link rel="stylesheet" href="assets/css/styles.css?v=32" />
</head>
<body>
  <div id="site-header" data-slim="true"></div>

  <main class="container-x" style="max-width: 860px;">
    <article class="px-6 py-10">
      <!-- Breadcrumb -->
      <div class="text-sm text-gray-500 mb-4">
        <a href="index.html" class="hover:underline">Home</a> ›
        <a href="real-or-fake.html" class="hover:underline">Fact-checks</a> ›
        <span>Tunis</span>
      </div>

      <span class="cat-tag tag-fact" style="display:inline-block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:0.8px;padding:3px 10px;border-radius:2px;margin-bottom:12px;">Fact-check</span>
      <h1 class="font-serif" style="font-size:46px;line-height:1.1;margin:8px 0 16px;">
        Is this viral video of flooding in Tunis authentic?
        Our frame-by-frame verification
      </h1>
      <p style="font-size:20px;color:#4a4a4a;line-height:1.5;">
        The 47-second clip topped 800,000 views on X and TikTok in two
        days. Our Image–Caption Coherence and Edited Photo Detection
        analyses reconstructed the origin of every shot.
      </p>

      <div class="flex items-center gap-3 mt-6 mb-8 pb-6 border-b" style="border-color:var(--line);">
        <div style="width:48px;height:48px;border-radius:50%;background:var(--rose);display:flex;align-items:center;justify-content:center;font-weight:800;color:var(--navy);font-family:'Playfair Display',serif;font-size:20px;">M</div>
        <div>
          <div class="font-semibold">Maryem Ben Slimane</div>
          <div class="text-sm text-gray-500">Lead — Caption Fidelity · Published April 27, 2026 at 9:42 AM</div>
        </div>
      </div>

      <!-- Hero image -->
      <img src="https://images.unsplash.com/photo-1547683905-f686c993aae5?auto=format&fit=crop&w=900&q=80" alt="Urban flooding" style="width:100%;height:auto;display:block;margin-bottom:20px;" />
      <p class="text-sm text-gray-500 mb-8" style="font-style:italic;">
        Screenshot of the viral video as it circulated on April 26 on X. Credit: "Tunisie en direct" account.
      </p>

      <!-- Smart Brevity boxes -->
      <div class="sb-box why">
        <span class="sb-label">Why it matters</span>
        During extreme climate events, decontextualized videos amplify fear
        and saturate emergency services. Verifying quickly and publishing
        the chain of origin is the first line of defense.
      </div>

      <p style="font-size:17px;line-height:1.7;margin-bottom:18px;">
        The video, first posted on Tuesday at 9:17 PM, shows submerged
        streets presented as filmed "tonight in Tunis." Within 90 minutes,
        the clip had been picked up by five pan-Arab accounts totaling 4.2
        million followers. Our team began analysis at 10:04 PM.
      </p>

      <div class="sb-box big">
        <span class="sb-label">The big picture</span>
        Three key shots — out of the twelve in the video — come from a
        separate flood event in Bab Bhar, in September 2018. Two new shots
        were authenticated in Manouba this morning, around 6:12 AM.
      </div>

      <h2 class="font-serif" style="font-size:30px;margin:30px 0 14px;">What our modules found</h2>
      <ul class="sb-bullets">
        <li><strong>Image–Caption Coherence</strong> noted a 3,200 K luminance
          shift between shots 4–7 and the rest: the classic signature of
          nighttime archive footage re-injected into a daytime video.</li>
        <li><strong>Edited Photo Detection</strong> isolated two added objects —
          a road sign and a pharmacy sign — overlaid on 2018 frames.</li>
        <li>The <strong>EXIF metadata</strong> was stripped on the viral
          version, but the version posted 16 minutes earlier by another
          account still carries a timestamp dated <strong>September 14, 2018</strong>.</li>
        <li>By contrast, two shots (8 and 11) are <strong>authentic and unpublished</strong>:
          they correspond to a local flood event that occurred this morning in Manouba.</li>
      </ul>

      <h2 class="font-serif" style="font-size:30px;margin:30px 0 14px;">How we established this</h2>
      <p style="font-size:17px;line-height:1.7;margin-bottom:18px;">
        The Verify verification process combines a reverse image search
        (Yandex, TinEye, Google Lens) with our own visual analyses. For this
        video, the first archived match was found in 4 minutes via TinEye
        on frame 156. It pointed to a Mosaïque FM article published on
        September 15, 2018.
      </p>

      <p style="font-size:17px;line-height:1.7;margin-bottom:18px;">
        Once the source was identified, our analysts aligned each shot of
        the viral video with the original archive, shot by shot. Shots 8
        and 11 produced no match: they were then submitted to AI-Generated
        Media Detection, which returned a confidence score &gt; 92% in
        favor of authenticity.
      </p>

      <div class="sb-box next">
        <span class="sb-label">What's next</span>
        Our newsroom is opening an investigation into the Telegram channels
        that first posted the video, and into the modus operandi — the same
        archived shots were used last March for a false alert in Sfax.
        Results expected on May 5.
      </div>

      <!-- CTA banner -->
      <div class="verify-banner">
        <div>
          <h3>Want to verify suspicious content yourself?</h3>
          <p>Upload an image, video or link — our five modules give you a score in less than 2 minutes.</p>
        </div>
        <a href="verifier.html" class="btn-yellow">Verify this content</a>
      </div>

      <p style="font-size:17px;line-height:1.7;margin-bottom:18px;">
        The stakes go beyond this one case. Over the past seven days,
        Verify processed 421 user-flagged contents. 38% were marked as
        manipulated, 17% as out of context. The rest — the majority —
        is authentic: verification isn't just about debunking, it's also
        about confirming.
      </p>
    </article>

    <!-- Related articles -->
    <section class="px-6 pb-12">
      <h2 class="font-serif text-3xl pb-2 mb-4 border-b">More to read</h2>
      <div class="grid grid-cols-1 md:grid-cols-3 gap-6">
        <article class="article-card">
          <a href="article.html"><img src="https://images.unsplash.com/photo-1521791136064-7986c2920216?auto=format&fit=crop&w=900&q=80" alt="" /></a>
          <span class="cat-tag tag-fact">Fact-check</span>
          <a href="article.html"><h3>Was this Sfax protest photo manipulated?</h3></a>
          <p>Two retouching traces flagged by Edited Photo Detection.</p>
        </article>
        <article class="article-card">
          <a href="article.html"><img src="https://images.unsplash.com/photo-1554224155-1696413565d3?auto=format&fit=crop&w=900&q=80" alt="" /></a>
          <span class="cat-tag tag-fact">Fact-check</span>
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          <p>Cosmetic Ads Fact-Check confirms a partial voice synthesis.</p>
        </article>
        <article class="article-card">
          <a href="article.html"><img src="https://images.unsplash.com/photo-1605792657660-596af9009e82?auto=format&fit=crop&w=900&q=80" alt="" /></a>
          <span class="cat-tag tag-clim">Climate</span>
          <a href="article.html"><h3>Tunisia faces its worst water stress since 1947</h3></a>
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        </article>
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