KEY POINTS
  • The coalition's statement ramps up tensions
  • The Saudi-led coalition's statement said the closures would be temporary and "take into account" the work of humanitarian and aid organizations

The Saudi-led coalition fighting in Yemen closed off the land, sea and air ports to the Arab world's poorest country early Monday after a rebel-fired ballistic missile targeted Riyadh, blaming the launch on Iran and warning it could be "considered as an act of war."

The coalition's statement ramps up tensions between the ultraconservative Sunni kingdom and its Shiite rival Iran, both of which have interests in Yemen's yearslong conflict. The bloodshed continued Sunday as an Islamic State-claimed militant attack in Aden killed at least 17 people.