WASHINGTON, Feb 1 (Reuters) - Outgoing U.S. Defense Secretary Leon Panetta accused Iran of an intensified campaign to destabilize the Middle East by smuggling anti-aircraft weapons to militant allies, The Wall Street Journal reported on Friday. "There is no question when you start passing MANPADS around, that becomes a threat, not just to military aircraft but to civilian aircraft," Panetta told the newspaper in an interview. "That is an escalation."