In pictures: Chicago nightclub tragedy

Police are appealing for information following a deadly stampede at a Chicago nightclub that left at least 21 people dead.

Panic broke out as clubbers scrambled to get out of the Epitome club after Mace or pepper spray was used.

Hundreds of screaming guests tried to get out

A night out clubbing had turned to tragedy

Police are investigating reports of locked or blocked doors

Shock is etched on the faces of those who managed to escape

Desperation for those with friends or relatives who were inside

Stunned by the loss of life, the local community paid its respects