From Tucson, Ariz.: A warning has been issued by a school district regarding a viral social media trend. This trend features a character from a popular children's book series in a menacing way. It involves altered images and videos accompanied by threatening language.

Safety concerns have been sparked at schools. The trend has been circulating in various communities.

Further details about the trend and the warning are available from the school district, which sent a letter to parents to inform them about the issue.