Heavy fighting in Yemen, Saudi Arabia trains tribal fighters

A man looks at a school destroyed by an air strike as he flees his home in Sanaa April 28, 2015. REUTERS/Mohamed al-Sayaghi

ADEN/DOHA (Reuters) - Saudi-led air strikes hit five Yemeni provinces as fighting raged in the southern city of Aden on Wednesday, and sources in the region said the kingdom was training armed tribesmen to fight the Iran-allied Houthi group.

Houthi rebels' tanks and snipers killed at least 12 civilians overnight in Yemen's Aden as they advanced towards the centre of the city, residents said, and a Saudi-led coalition airdropped arms to anti-Houthi fighters in the city of Taiz.