Brent oil prices dipped below $30 in Asian hours Thursday, underscoring weakness in the energy market amid a continued increase in the supply of the commodity.

U.S. WTI light sweet crude fell as much as 0.7 percent and was last at $30.66 a barrel while Brent oil fell as much as 1.9 percent to $29.73--its lowest level since February 2004--and was last at $30.05 a barrel.