I would try the following (not tested)
<?php
$friends = get_users( array( 'role' => 'friends' ) );
$friend_ids = array();
foreach( $friends as $friend )
$friend_ids[] = $friend->ID;
$news = new WP_Query( array( 'author' => implode( ',', $friend_ids ), 'post_type' => 'news', 'paged' => get_query_var('paged') ) );
?>
Note: ‘friends’ is the role ID, not the nice name. Then use the loop as normal :
<?php if ( $news->have_posts() ) : while ( $news->have_posts() ) : $news->the_post(); ?>
...
<?php endwhile; endif; ?>
<?php wp_reset_postdata(); ?>
Hopefully that will work 🙂