NEW YORK (AP) — Investigators worked Wednesday to determine what led a truck driver to mow down people on a riverfront bike path near the World Trade Center, brandishing air guns and yelling "God is great!" in Arabic as his deadly route of terror ended with a crash, authorities said. Eight people were killed and 11 seriously injured in a Halloween afternoon attack that the mayor called "a particularly cowardly act of terror." The driver — identified by officials as an immigrant from Uzbekistan — was in critical condition but expected to survive after a police officer shot him in the abdomen.