Mourners hold photos of their loved ones during the 15th anniversary celebration of the attacks of the World Trade Center at the National September 11 Memorial, Sunday, Sept. 11, 2016, in New York. (AP Photo/Mary Altaffer)

On 15th anniversary of 9/11, ‘the grief never goes away’

The U.S. marked the 15th anniversary of 9/11 on Sunday, with victims’ relatives reading their names and reflecting on a loss that still felt…