"Elmo's X account was briefly compromised yesterday by an unknown hacker who posted disgusting messages, including antisemitic and racist posts. The account has since been secured," a spokesperson for Sesame Workshop, the nonprofit educational organization behind Sesame Street, said in a statement to ABC News on Monday.

The account of the 3-year-old Sesame Street character turned hateful and certainly not suitable for kids. Here's what the hacked account said.

Elmo's X account posted antisemitic and racist posts after it was hacked on Sunday, a spokesperson for the makers of "Sesame Street" said in a statement.