NEW YORK (AP) -- The nation's gathering war against a new upsurge in Islamic terror hung heavy over the 13th anniversary of the Sept. 11 attacks Thursday, stirring both anxiety and determination among those who came to ground zero to remember their loved ones.The familiar silence to mark the attacks and the solemn roll call of the nearly 3,000 dead came just hours after President Barack Obama told the country he is authorizing stepped-up airstrikes in Iraq and Syria against Islamic State extremists.\It's an ongoing war against terrorists. Old ones die out and new ones pop up