By Timour Azhari and Hatem Maher

RIYADH/CAIRO, Sept 25 (Reuters) - Saudi, Turkish and Pakistani military chiefs are to meet to discuss how to support Saudi Arabia under a joint defence pact, after Saudi's top religious authority told troops to be ready to lay down their lives to fight Yemen's Iran-aligned Houthis.

The Houthis have launched strikes on the Saudi-backed government in Yemen and ‌repeatedly fired into Saudi Arabia, disrupting oil flows from the world's largest energy exporter, as part of a wider Middle East war that began with US and Israeli strikes on Iran in ‌February.

The Houthis said they had fired dozens of missiles and drones at Saudi targets on Thursday, while authorities in Saudi Arabia said they had intercepted six ballistic missiles fired by Houthi fighters.

Saudi Arabia had earlier issued emergency alerts for areas including the holy city of Mecca, as ​well as Jed...