I would agree if they were actually quoting someone or if it was a more substantial quote. In this case, it appears to be an anonymous source.
From the text: "a government source says", "In a statement, the Houthis say", "The group also claims...", "They group's military spokesman claims...".
From the text: "a government source says", "In a statement, the Houthis say", "The group also claims...", "They group's military spokesman claims...".