PLEASANTON, Calif. - A Friday morning explosion that damaged the corporate headquarters of a nutritional company - giving hundreds of employees an unexpected day off - is being looked at as possible domestic terrorism, officials said. "We are investigating all possibilities at this time," FBI spokesman Anthony Montero told reporters. The explosion at Shaklee Corporation caused only minor damage, but rattled a few nerves. It was the second such explosion outside of a Bay Area business in a month. Police responded to the Willow Road office complex about 3:22 a.m. after 911 calls reported an explosion, said police Lt. David...