Either fools or knaves, this was an act of negligence or wilful negligence.
Times, Sunday Times
Failing to act now would almost be an act of negligence.
Times, Sunday Times
Was it intentional or an act of negligence or a tragic accident?
Globe and Mail
She called the glaring omission of his status a newsworthy act of negligence.
Retrieved from Wikipedia CC BY-SA 3.0
These people can't be allowed to get away with what are shocking acts of negligence.
The Sun