Saudi Arabia said on Friday that it had launched air strikes against Yemeni rebels to "neutralise" infiltrators who had crossed the frontier and killed a Saudi border guard. The air strikes from southern Jizan province were to "neutralise the firing by intruders" and to clear areas where they had encroached on Saudi territory, the government said in a statement on the official SPA news agency. Earlier, a government advisor said Saudi F-15 and Tornado jets had begun bombing the positions of the Zaidi rebels inside Yemeni territory on Wednesday in response to a rebel attack on a border post a...