By Shariq Khan

(Reuters) -Oil prices were little changed in early Asian hours on Friday, but were headed for their steepest weekly losses since late-June, as investors expressed concern over the impact to the global economy from tariffs that kicked into effect on Thursday.

Brent crude futures were down three cents to $66.40 a barrel at 0050 GMT, on track to decline more than 4% week-over-week. U.S. West Texas Intermediate crude futures were down six cents, or 0.1%, to $63.82 a barrel, set to fall more than 5% on a weekly basis.

Higher U.S. tariffs against a host of trade partners went into effect on Thursday. The tariffs raised concerns of weaker economic activity, which would hit demand for crude oil, ANZ Bank analysts said in a note.

Oil prices were already reeling from the OPEC+ gro

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