The store has been sealed off by officers
The car park at the store in south Derbyshire was sealed off with police tape.
A police car was parked up outside the shop in Swadlincote, which would normally be busy with morning shoppers as it is on a main road.
Staffordshire Live said customers were being turned away by officers.
There was also police tape across the automatic doors which lead inside the store.
It is currently unclear exactly what has happened.
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