The communications app TeleMessage, which was spotted on former US national security adviser Mike Waltz's phone, has suspended “all services” as it investigates reports of at least one breach.

The clone, TeleMessage, was the subject of a reported hack in which the contents of some direct messages and group chats were stolen.

Smarsh, the Oregon-based owner of TeleMessage, said Monday it was “investigating a potential security incident” and suspended its services out of an abundance of caution.