article_snippet.sent: Authorities  reiterated that the Sunni alliance, which was set up by the Arab nations against the Houthi Shiite rebels, is boosting the Houthi Shiite rebels military presence in the Saudi Arabia-Yemen border.
article_snippet.sent: Saudi Arabia shares a 1,120 mile-long border with Yemen -- much of which is incredibly porous. '
article_snippet.sent: The Houthis are moving from one place to another in search of safe havens.
article_snippet.sent: We will make sure that there will be no safe place the militants to hide on the Saudi Arabia-Yemen border,'
article_snippet.sent: Critics of the Houthis charge that they are
article_snippet.sent: an Iranian proxy — a claim the rebels deny.
article_snippet.sent: Iran has provided aid to the rebels, but both Tehran and the Houthis deny Iran has armed the rebels.