How to remove all images from html with dom

I am trying to remove all images from an HTML string. I can only remove the first one and I don't know why.

the code:

<?php
$str='<div>
  <a href=
  "https://www.google.com">
  <img src=
  "image1.jpg"
  alt="image-1.jpg" /></a>
</div>
<p>
  hobby\'s vs hobbies&nbsp;
</p>
<div>
  <a href=
  "https://www.google.com">
  <img src=
  "image2.jpg"
  alt="image-2.jpg" /></a>
</div>';
$dom=new domDocument;
$dom->loadHTML($str);
$images=$dom->getElementsByTagName('img');
foreach($images as $image)
{
    $image->parentNode->removeChild($image);
}
$result=$dom->saveHTML();
echo '<textarea>'.$result.'</textarea>';    
?>