Fatal Error when importing Feed

I received the following Fatal Error when trying to import this feed: http://flashalert.net/rss.html?id=941
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Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /var/www/html/drupal_test/sites/all/modules/feeds/libraries/PuSHSubscriber.inc:79 Stack trace: #0 /var/www/html/drupal_test/sites/all/modules/feeds/libraries/PuSHSubscriber.inc(79): SimpleXMLElement->__construct('<?xml version="...') #1 /var/www/html/drupal_test/sites/all/modules/feeds/plugins/FeedsHTTPFetcher.inc(158): PuSHSubscriber->subscribe('http://flashale...', 'http://web.clat...', '') #2 /var/www/html/drupal_test/sites/all/modules/feeds/plugins/FeedsHTTPFetcher.inc(143): FeedsHTTPFetcher->subscribe(Object(FeedsSource)) #3 /var/www/html/drupal_test/sites/all/modules/feeds/includes/FeedsSource.inc(179): FeedsHTTPFetcher->sourceSave(Object(FeedsSource)) #4 /var/www/html/drupal_test/sites/all/modules/feeds/feeds.pages.inc(82): FeedsSource->save() #5 /var/www/html/drupal_test/includes/form.inc(776): feeds_import_form_submit(Array, Array) #6 /var/www/html/drupal_test/includes/form.inc(416): form_execute_handlers('submit', Arr in /var/www/html/drupal_test/sites/all/modules/feeds/libraries/PuSHSubscriber.inc on line 79
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Running Apache/2.2.3 (Red Hat)
PHP 5.2.10
MySQL 5.0.77
Drupal 6.16

Feed settings:
Emergency Alerts
* Attached to: [none]
* Refresh: every 15 min
* Import on create
HTTP Fetcher
Download content from a URL.
Common syndication parser
Parse XML feeds in RSS 1, RSS 2 and Atom format.
Node processor
Create nodes from parsed content.
Content Type: Feed Item
Update Existing Items.
Expire after 6hrs.
Mapping:
Title Title
Description Body
Published date Published date
Item URL (link) URL
Item GUID GUID
Item URL (link) RSS Source