Hyundai Motor, South Korea's top automaker, reported a surprise 8.6% drop in quarterly operating profit on Thursday, hit by a stronger won and weaker sales after partial strikes.

Hyundai posted an operating profit of 307 billion won in October-December of 2006, well below a Reuters forecast for a 386.7 billion won profit. The company reported 336 billion won in operating profit a year ago and 183 billion in the previous quarter.