Oil prices eased on Friday but were heading for weekly gains on uncertainty over Middle East supplies and a larger-than-expected draw from crude stockpiles in the United States. Houthis claim attack targeting Riyadh airport with ballistic missile Brent crude futures fell 50 cents, or 0.47%, to $105.42 a barrel by 0623 GMT, while US West Texas Intermediate crude futures were down 49 cents, or 0.