From NBC News.

The national average for gas is now $3.41 per gallon, up 43 cents from a week ago. But experts warn that gas prices could rise even further and approach $4 per gallon as soon as next week. It comes as the war with Iran has caused oil shipping in the critical waterway the Strait of Hormuz to slow down. Some oil producers have announced they will slow production as shipping risks rise. NBC News’ Allie Canal reports.