Japan's Nikkei fell 1.8 per cent in morning trade to head for a weekly loss of 4.7 per cent. Photo: AP PHOTO

Tech-heavy stock markets were heading for their biggest weekly fall in seven months, as investors fretted over the sustainability of a rally in artificial intelligence stocks.

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Weaker-than-expected China trade data on Friday also showed how hard US President Donald Trump's tariffs have hit.

The STOXX benchmark of 600 big European companies edged down 0.17 per cent in early trading Friday morning, even as US markets looked set for a brighter open with S&P 500 futures and Nasda

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