Memorial rituals are taking place to mark a significant anniversary. A new poll suggests that about half of US adults recall this event as the most historic of their lifetime. The aftermath of the attack has been far-reaching, with nearly 3,000 deaths and a lasting impact.

Private reflection and education are also part of the commemoration. Some people will participate in volunteer projects as a tribute. Further details about the anniversary and its significance are available.

A police officer plans to spend time at a station house, although specifics about the visit are not provided.