Indian stock markets ended the week in the red, with Nifty forming a bearish pattern on weekly charts. The US markets closed higher on Friday, with Nasdaq up for the seventh straight week. The Nifty has support levels at 18,500 - 18,450 and hurdles at 18,680 - 18,780. Among the global events this week, the US Federal Reserve will announce its June monetary policy. Inflows into Indian equity mutual funds fell by 50% in May to Rs 3,240.30 crore. The INR ended at 82.4625 against the US dollar.