Oct 26 (Reuters) - Yemen's Iran-aligned Houthis said on Monday they had attacked Saudi Arabia's East-West crude oil pumping stations and Riyadh airport, as rising hostilities choke oil supplies. Oct 26 (Reuters) - The Iran-aligned Houthi group in Yemen said on Monday it had attacked Saudi Arabia's East-West crude oil pumping stations and Riyadh airport, but there was no immediate.