Police said the bomb hoax was an effort to draw officers into the area. Rioters have attacked police officers in Lurgan with petrol bombs, fireworks and paint bombs.
It happened as officers investigated a security alert on the Antrim Road in the town on Saturday night. It turned out to be a hoax.
The police said one baton round was discharged, which it is believed struck a rioter in the lower leg.
The railway line between Moira and Portadown was closed for a time, due to debris thrown onto it by the rioters.
Police said the bomb hoax was an effort to draw officers into the area.
SDLP Upper Bann MLA Dolores Kelly said those involved in the trouble are a minority.
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