New Delhi, Jan. 1 -- Saudi Arabia bombed Yemen's port city of Mukalla on Tuesday after a weapons shipment from the United Arab Emirates arrived for separatist forces in the war-torn country, and warned that it viewed Emirati actions as "extremely dangerous."

The bombing followed tensions over the advance of Emirates-backed separatist forces known as the Southern Transitional Council. The council and its allies issued a statement supporting the UAE's presence, even as others allied with Saudi Arabia demanded that Emirati forces withdraw from Yemen in 24 hours' time.

The UAE called for "restraint and wisdom" and disputed Riyadh's allegations. But shortly after that, it said it would withdraw its remaining troops in Yemen. It remained uncl...