European stock markets fell at the open on Tuesday after a mixed Asian session, as attention turns to the Federal Reserve and the start of the US central bank’s policy meeting. London’s benchmark FTSE 100 index dropped 0.7 percent to 6,973.77 points. In the Eurozone, Frankfurt’s DAX 30 index lost 0.5 percent to 15,534.47 points and the Paris CAC 40 shed 0.4 percent to 6,553.71.