Security officials ordered staff inside Madrid's Torrespacio tower to leave the building on Tuesday after receiving a bomb threat over the phone, a police spokesman said.

"A bomb threat was received. ... Evacuation has started, we have to work and do checks," a police spokesman told the AFP news agency.

The 57-story, 235-meter (770-foot) high skyscraper in the Spanish capital's northern business district is home to the British, Australian, Dutch and Canadian embassies.

The Australian embassy said on Twitter that it would remain closed for the rest of the day.

Read more: Deutsche Welle