Scant information out there, but Reuters just tweeted the news and a photo. Twitchy will monitor and update.

Update: According to this report, the shooter is in custody and no one has been injured.

More:

Hmm:

https://twitter.com/kofiabiney/status/335510463045574656

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Update:

Reuters is quoting a police source as saying that the shooter “appears to be a crazy guy” who was carrying a dummy grenade and a knife.