British Prime Minister David Cameron returned to Downing Street late Saturday to deal with the latest news of another beheading in Iraq.. that of British national David Haines.<br/> <br />Cameron has vowed to bring those responsible to justice and will hold security meetings with his cabinet later Sunday.<br/> <br />The incident marks the latest in a series of escalations from Islamic State militants that's prompted US President Barack Obama to announce enhanced military plans to help defeat the group.<br/> <br />US Secretary of State John Kerry has been building a coalition of support for Obama's plan and is expected to meet with other world leaders in Paris on Monday.<br/> <br />Coalition partner Australia is the first nation to commit to sending troops.<br/> <br />Prime Minister Tony Abbott.<br/> <br />(SOUNDBITE) (English) AUSTRALIAN PRIME MINISTER TONY ABBOTT SAYING:<br/> <br />" within about the last twenty four hours received a specific request from the United States government to contribute forces to possible mi
