No you do not need Police Report. . .
Documents Needed:

*I-20 with recent travel Signature.
*If you have Graduate Assistantship, A letter from your School.
*Register for classes for next Semester and show them that you're coming back to US for continuing  Study
*Recent Transcript--US Embassy doesn't allow you to take Sealed Envelope during Interview..
*Bank Statement
*Zero Balance Certificate from Registar's Office (Show them you've paid all the Balances)
*Student ID Card (Trust me it's a good impression on the Consular, Put that ID card on the first page of your File)
*If you have money in your account in US, Take that certificate too.

That's all you need.. I renewed my Visa in May 2010 and it was very Easy.

Good Luck.