ABOARD A U.S. MILITARY AIRCRAFT The top U.S. military officer said Sunday he does not assume Iran's brief seizure of an Iraqi oil well is part of an orchestrated plan in Tehran to threaten its neighbors. Adm. Mike Mullen also said he's worried about "the clock now running" on the Obama administration's efforts at trying to keep the lines of communication open with Iran. The administration had given a rough deadline of the end of 2009 for Iran to respond to an offer of engagement and show that it would allay world concerns about its nuclear program.