Iranian flights to Yemen are violation of sovereignty, says Yemeni official

Plane bringing Houthi delegation home from Tehran had to divert after Yemeni government bombed Sana'a airport

• Middle East crisis live - latest updates

Iranian flights to and from Yemen are an unacceptable violation of the country's sovereignty, the vice-president in Yemen's Saudi-backed, UN-recognised government has said.

Abdullah al-Alimi said in an interview that the planes contained equipment for the Houthi movement, which he said had transformed from merely a domestic threat into a regional and international threat to global security and the global economy.