shabaab, linked to al qaeda. al jazeera courtney kealy has the story. >> homeland security secretary jeh johnson went on the sunday talk shows. >> his most recent video reflects that. >> his message stay prepared. the mall of america is one of the largest shopping venues in the world. al shabaab's threat is being treated seriously in the past because it has recruited dozens of young men in recent years. >> their recruitment is worldwide, wherever somalis live western europe or north america they will try to recruit. they have no boundaries as far as their reach is concerned. >> just days ago community letters from the minneapolis-st.