RSS2 and PHP problem

With
<?PHP include('news/wp-rss2.php'); ?>
It produces
<pre>Warning: Cannot modify header information – headers already sent by (output started at /home/geoffers/public_html/f1unleashed/templates/header.php:10) in /home/geoffers/public_html/f1unleashed/news/wp-rss2.php on line 4
http://f1unleashed.geoffers.uni.cc/news/index.php F1 Unleashed News en Copyright 2004 Thu, 18 Mar 2004 21:11:24 +0000 http://wordpress.org/?v=1.0.1 http://f1unleashed.geoffers.uni.cc/news/index.php?p=3 http://f1unleashed.geoffers.uni.cc/news/index.php?p=3#comments Wed, 17 Mar 2004 10:37:00 -0800 geoffers (mailto:geoffers@geoffers.uni.cc) 2004 3@http://f1unleashed.geoffers.uni.cc/news/index.php 1. Michael Schumacher 2. Rubens Barricello 3. Fernando Alonso 4. Ralf Schumacher 5. Juan Montoya 6. Jenson Button 7. Jarno Trulli 8. David Coulthard</pre>
before what it is suppost to show and
<pre>]]></pre>after, how do I get rid of this.