Oil ends higher for the session, tallies a 4th straight monthly gain

Oil futures climbed Tuesday, as the expiration of U.S. waivers on Iran oil sanctions later this week and renewed political turmoil in Venezuela raised the risks to global oil supplies. June West Texas Intermediate oil climbed 41 cents, or 0.7%, to settle at $63.91 a barrel on the New York Mercantile Exchange. Prices rose 6.3% for the month, marking a fourth straight monthly rise, according to Dow Jones Market Data.

Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.