Volkswagen shares slumped 4 percent in mid-afternoon trade Friday, wiping out earlier gains, as Germany's transport minister said 2.8 million vehicles in the carmarker's home turf were also fitted with emissions rigging devices.

At 1335 GMT, the stocks were trading 4.01 percent lower at 107.65 euros, off from the intraday high of 117 euros in the first few minutes after the market opened.