A bomb hoax sent to the headquarters of the Construction, Forestry, Mining and Energy Union in Melbourne today made threats against specific union leaders who have been locked in a bitter dispute with construction company Grocon in recent weeks.

Police were called to the union’s headquarters at 500 Swanston Street at 10am today after a letter was delivered to the union office stating that a bomb had been placed inside the building.

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Workers were evacuated and Swanston Street was closed between Queensberry and Victoria streets while police investigated the threat.