Reuters Market Eye - Sun Pharmaceutical Industries slumps as much as 6 percent, heading towards its biggest single day fall since March 16, 2012.
*Ranbaxy Laboratories also fell as much as 6 percent.
* Media reports say surprise inspection by U.S. drug regulator on its Halol plant in Gujarat.
* A company spokesman said, "We have no comments to offer".
* "Majority of the inspections taking place nowadays are surprise inspection," Motilal said in a note to its clients.
* Must wait for the final audit report to come, the Motilal note adds.
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* Also, Sun Pharma recalled 200 vials of a cancer drug in July.
* Separately, the U.S. FDA said in May that Sun Pharma's response to the import ban on its Karkhadi plant in Gujarat was inadequate.
(Reporting by Abhishek Vishnoi)