Police have closed off a number of blocks in Toronto's downtown financial district because of an unstable antenna on the Trump International Hotel and Tower Toronto.

Toronto police spokeswoman Lyn Dsey said Monday three blocks around hotel and condo tower are cordoned off.

The building is in the heart of Canada's financial capital and is normally bustling with people going to work Monday morning.

It isn't clear when the streets around the building will be reopened.

The building's namesake is billionaire Republican presidential candidate Donald Trump.