Yemen's Houthis have renewed threats against Saudi Arabia's airspace, warning airlines, travellers and workers to stay away from the kingdom's airports. This comes after a deadly strike on Riyadh's King Khalid International Airport killed 12 people and injured more than 300 others. It's the deadliest such attack in Saudi Arabia in over a decade. The Houthis have not claimed responsibility for the strike, which has drawn international criticism from the United Nations, European Union, Britain and Germany. US President Donald Trump says Washington is considering joining Saudi military strikes against the Houthis. Blake Sifton reports from Tel Aviv.