Security at the Los Angeles Forum were called in to protect Metallica stars James Hetfield and LARS ULLRICH when the rockers were almost mobbed at a Heaven + Hell concert last week (25Apr07). The duo were spotted by rock fans at the sound desk just before Black Sabbath offshoot Heaven + Hell took to the stage. Website reports Hetfield and Ullrich were chatting to Alice In Chains star Mike Inez when fans spotted them and swarmed. One fan says, "Word got out and they were almost mobbed. Security had to go over and form a line across the sound area to prevent anybody getting in. "They started a 'Metallica, Metallica' chant." Heaven And Hell will appear as "special guests" of Metalica at a July (07) festival in Vienna, Austria.