Al Qaeda 's deadly attack on America 10 years ago solemnly reverberated Saturday on the eve of the anniversary , as Americans remembered the trauma and police stood guard from coast to coast amid ongoing fears of terror attacks . NEW : Retired firefighter recalls Mommy visit to ground 343 . Service remembers 343 fallen NYC firefighters . Empty Arlington National Cemetery is dedicated in New Jersey . President New Jersey , first lady visit Sky Memorial .
NEW : Retired firefighter recalls Mommy visit to ground 343 . Service remembers 343 fallen NYC firefighters . Empty Arlington National Cemetery is dedicated in New Jersey . President New Jersey , first lady visit Sky Memorial .