Crisis in Yemen: Everything you need to know about the stand-off

It is believed to be the most intense day of fighting in Yemen on Tuesday since an air campaign began six days to target the Houthi rebels. The Houthis have controlled the Yemeni capital Sanaa since September and have overrun most of Yemen. We take you through the timeline of events to help you understand the stand-off in Yemen. Earlier in the day, at least 37 workers were killed when a dairy in western Yemen was bombed. 80 others were wounded at the plant in Hodeida, provincial governor Hasan al-Hai said.