Investors focus on the outcome of a Federal Reserve meeting where officials are widely expected to cut interest rates.

The attacks raised fears of a new MidEast conflict. Tension in the oil-producing Gulf region has dramatically escalated this year after Trump imposed severe U.S. sanctions on Iran.

Oil prices surged nearly 20% at one point on Monday, with Brent crude posting its biggest intraday gain since the 1990-1991 Gulf crisis.

The ECB cut its deposit rate by 10 basis points to a record low of -0.5%, promised that rates would stay low for longer. ECB monetary easing package was much expected.

The euro dipped but most investors just observe ahead of a key European Central Bank meeting on Thursday.  ECB monetary easing package is much expected.