Derby County's Pride Park has been evacuated ahead of the clash with Cardiff City on Friday evening.
Around 30 minutes before kick-off, at 7.15pm, an announcement came on the Tannoy to clear the stadium.
It is believed that flares fired in the away section concourse was the reason for the action.
The start of the game is not set to be delayed, according to Sky Sports.
Neil Warnock's preparations for the match were already affected by news that Lee Tomlin would miss the game due to being involved in a car crash during the week.
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