He said Pc Henry was attending 999 calls from two members of the public after a man, said by witnesses to be a window cleaner, was stabbed in the back.
Chances came and went for both sides, and it looked as though Reading would be consigned to a second defeat in two games until Kebe stabbed home from six yards late on.
Ellington was continuing to be a menace to the City defence but Clarkson made sure of the points when he stabbed the ball in after Keogh's shot was saved.
The silence was also due to be observed by mourners at the funeral of Scots Guardsman Paul McGee, who died after being stabbed in Lochwinnoch in Renfrewshire.