More trouble at the Oval?

When driving through SE11 and past the Oval tube station yesterday, I noticed what looked like a memebr of the police force boarding a bus that had been stopped just outside Oval tube station. A few hours later, I drove passed again and noticed that Oval tube had an "incident response unit" outside. Also, the road around the Oval was closed.

I've no idea whether that was one, two or three events of any significance. Does anybody have any information?