Equity markets around the world slid lower Friday after U.S. President Donald Trump warned that he could slap another $100 billion of extra tariffs on China's imports, fanning fresh fears of a full-blown trade war between the two superpowers, dealers said.

World equities had powered higher Thursday as investors judged recent trade war fears were overblown.

While the 0.3 percent monthly rise was above expectations, the 2.7 percent annual gain was in line with what analysts had expected, meaning it is unlikely to push the U.S. Federal Reserve to hike interest rates faster than planned.

China said Friday it is ready to pay "any cost" in a trade war following Trump's threat of an additional $100 billion in tit-for-tat tariffs on Beijing.

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