Internal memo sheds more light on police actions night of March 22 violence

"From the accounts of the supervisors on duty that night it was obviously a very busy evening for them and things were beginning to pop-up in other divisions," according to the memo.

And, as they have said publicly, police said in the internal correspondence that this was not a typical event and not expected to occur again.

"This kind of activity we saw on Saturday is not normal for the park, downtown or any other neighborhood incident". It was "truly unique" and police believed "things will return to normal.

"But to help people feel more comfortable, we have pledged to have an enhanced presence in and around the park for the foreseeable future."