stolen Trek 820

This is a Trek 820 mountain bike. It was locked to the bike rack and my girlfriend's Trek 7.2 FX bike at the Mill/3rd light rail station. We were gone between 6 PM and 11 PM, and when returned the lock had been cleanly cut and both bicycles were gone. Unfortunately, I purchased this bike on Craigslist, so I don't know the serial number, but it's possible my bike will turn up with her's (her serial number is wtu11360468g).