Not returning 404 for the menu path doesn't exist

General menu path "news/releases" gets executed for wildcards "news/releases/abcd", it should return 404 page.

I only have:
$items['news/releases'] = array(
'title' => 'Press Releases',
'page callback' => 'page_callback',
'access callback' => 'access_callback',
);

Only "news/releases" request should return 200 page, requests "news/releases/*" should return 404 page. What can I do to achieve this?