Oil prices slipped more than 3% on Monday after Iranian and Qatari officials held a third straight day of talks aimed at pushing for a deal to end the US-Israeli war on Iran. Brent crude futures fell $3.68, or 3.2%, to $109.75 a barrel by 0407 GMT while US West Texas Intermediate crude was at $100.69 a barrel, down $3.43, or 3.3%. Brent ended October at its highest in six months amid concerns that the US-Iran conflict could escalate again after Tuesday's US midterm elections.