Oil prices down on US crude build, China demand worries

Brent futures slipped 72 cents to US$80.46 a barrel by 0400 GMT. US West Texas Intermediate crude (WTI) shed 67 cents to US$75.99 a barrel.

Oil prices fell on Thursday, extending losses from the previous session, as signals of higher supply from the United States met worries about lackluster energy demand from China.

Brent futures slipped 72 cents to US$80.46 a barrel by 0400 GMT. US West Texas Intermediate crude (WTI) shed 67 cents to US$75.99 a barrel.