NEW YORK (AP) — President Barack Obama soberly laid a wreath Thursday at the World Trade Center site in New York, marking Osama bin Laden’s death where his al-Qaida followers inflicted the greatest damage.The president closed his eyes and clasped his hands at the outdoor memorial where the twin towers of the World Trade Center once dominated the Manhattan skyline. He shook hands with 9/11 family members and others dressed in black at the site where the skyscrapers were brought down by planes commandeered by bin Laden’s followers. Nearly 3,000 people were killed.“When we say we will never forget, we mean what we say,” Obama said.The president met privately at the memorial site with about 60 family members from various 9/11 organizations.