get_the_post_thumbnail() problem

Is there a way to get all the related post thumbnails with “get_the_post_thumbnail()”?

I’m using this in my taxonomy-{taxonomy}.php template:

<ul>
   <li>
         <a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>">
         <?php echo get_the_post_thumbnail( $ids, array(150,150) ); ?>
         </a>
   </li>
</ul>

The result is, that i’m only getting 1 thumbnail, instead of 2.

I’ve got 2 posts with each one post thumb.
These have the same taxonomy and I want to get those 2 thumbnails into the taxonomy template…

Is there a hack for this?