TOKYO: Oil prices fell on Monday amid mounting concerns that surging caseloads of coronavirus infections in India and other countries will lead to stronger measures and hit economic activity, along with demand for commodities such as crude.Brent crude was down 43 cents, or 0.6%, at $66.34 a barrel by 0139 GMT, after rising 6% last week. U.S. oil was down 42 cents, or 0.7%, at $62.71 a barrel, having gained 6.4% last week.