U.S. stock-index futures tumbled on Friday, as investors as investors worried about the likelihood of a global trade war following the U.S. President Donald Trump's promise to impose 25 percent tariffs on imported steel and 10 percent tariffs on foreign aluminum.

Global Stocks:

Nikkei 21,181.64 -542.83 -2.50%

Hang Seng 30,583.45 -460.80 -1.48%

Shanghai 3,254.58 -19.18 -0.59%

S&P/ASX 5,928.90 -44.40 -0.74%

FTSE 7,091.42 -84.22 -1.17%

CAC 5,159.97 -102.59 -1.95%

DAX 11,925.37 -265.57 -2.18%

Crude $60.83 (-0.26%)

Gold $1,324.90 (+1.51%)