not able to delete bridge!

Hello,

I have added a bridge "mybridge" using brctl bu not added any interfaces yet. Even the brctl show command looks:
bridge name bridge id STP enabled interfaces
mybridge 8000.0000000 no

Now I try to do: brctl delbr mybridge and it gives:
bridge mybridge is still up: can't delete it

I performed ifconfig mybridge down but still the problem persists!

How to delete the bridge?

Any help will be appreciated!
Thanks!