I work literally 50 metres away.
Building was locked down, we saw police running on overpass over Lower Thames Street (never good when you police running).
Heard a couple of shots then about 30-60 seconds later(enough to think, “was that a gunshot?”), heard 5-10 more. Then about 10 seconds later a couple more.
Not seen videos that go past the first couple of shots.
Then moved people away from windows, and about 20 mins later we had to evacuate out of the corden.