Saudi officials said they captured the ringleader of the gunmen, adding that he was shot and wounded while trying to escape. They did not identify him by name but said he was among the 25 most wanted terrorism suspects in the kingdom.
http://www.washingtonpost.com/wp-dyn/articles/A2174-2004May30.html

A Saudi group allied with al Qaeda asserted responsibility for the attack, posting statements on Islamic Web sites that described in gruesome terms the deaths of an American, a Briton, a Japanese and an Italian.