The news report says:
>"phenomenon which brought the area to a standstill."
>"the spectacle .....the "squadron" of around 15 orange lights spread panic among passers-by"..
>"People screamed - some fearing it was a terrorist attack. Police received 999 calls within minutes."
>"The lights moved in a southerly direction then hovered above Archway before disappearing and appearing again. The eerie display lasted about 10 minutes."
I motion the fact that this DOES NOT fit the description of any birds I have ever seen. Sorry ER, won't explain this one. Birds don't stay stationary in flight for 10 minutes, disappear and re-appear.
They also don't get people screaming and calling 911.
Could it have been a stunt? Yes.
Will have to wait for the follow up.