(Al Jazeera) – Yemenis have denounced Saudi Arabia’s decision to close the country’s land, air and sea ports, calling it an “unnecessary and dangerous act of collective punishment” that puts millions of civilians at risk and exacerbates the plight of the country’s most vulnerable. The kingdom, which is currently leading a coalition of Sunni Arab states in bombing Yemen, said it was “immediately” closing off access to all of Yemen’s ports after Houthi rebels fired a ballistic missile towards the Saudi capital, Riyadh.