SOME 2,000 workers have been told they can return to work following an alleged bomb threat on a skyscraper in Madrid. 

According to ABC, the supposed threat against the Australian Embassy inside the Torrespacio tower was a false alarm.

Sources told the newspaper the threat may have been caused by the triggering of a fire alarm.

Police, who are remaining on site, are investigating the events after carrying out a search for explosives with sniffer dogs.

The building, which also houses the British, Canadian and Dutch embassies, is one of the four towers of the Paseo de la Castellana.

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