European shares retreat at the open, trade tensions bite
A number of corporate announcements triggered strong swings, notably in BioMerieux.

At 0728 GMT, the pan-European STOXX 600 was down 0.4 per cent, with losses spread across industry sectors and trading centres.
A number of corporate announcements triggered strong swings, notably in BioMerieux.
The French pharmaceutical group was the best performer on the index, up 8.3 per cent after better than expected first-half results and a raised 2018 outlook.
In the same sector, Bayer fell 3 per cent after reporting a disappointing 3.9 per cent gain in underlying core earnings for the quarter.
Another French firm was also among the highest risers. Outdoor advertising group JCDecaux added 6.8 per cent after a rating upgrade by BofA Merrill.
Snuff and cigar maker Swedish Match fell 5.2 pct after an institutional investor sold a stake of 4.3 million shares at a discount.
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