In their latest statement, titled "Is it ever going to stop?", Luton expressed frustration and anger at the continued racial abuse aimed at their player.
"At 8.28 pm BST on Wednesday evening, an account in the UK on Instagram messaged Elijah with a racist comment," they wrote.
"After Elijah notified us following last night’s game with Sunderland, in which he scored his first goal of the season, we reported the incident to the Police and to Meta. It is now being investigated. Just like we said a year ago, and just like we will do WHENEVER a player or staff member is subjected to abuse, we will stand by and support Elijah unequivocally.
"To the individual who cowardly dropped into Elijah’s DMs: We know who you are and you know who you are. You’re not a faceless account, one which we have sadly become accustomed to reporting in recent years. But as if you have the balls to come to Kenilworth Road and say it to his face. We dare you. If you do, you’ll be faced with everyone at Luton Town Football Club, standing side-by-side with Elijah. Abuse of any kind is unacceptable. But does everyone know that? It’s why we are doing our bit to educate everyone that racism and all forms of abuse is abhorrent and unacceptable."