French and Canadian leaders have made phone calls to US President Barack Obama to express their condolences over the deadly shooting in a gay nightclub in Orlando in which 49 people were killed.

According to the White House, Obama spoke by phone with the French President Francois Hollande to accept his Hollande's condolences for the terrorist attack in Orlando.

"Obama thanked Hollande for visiting the US Embassy in Paris on Monday to express France's sympathy and support," the White House said yesterday.

Obama offered his own condolences on behalf of the American people for yesterday's fatal attack on a French police officer and his partner in France.

"Both leaders reaffirmed their shared commitment to degrading and destroying ISIL and standing against the broader scourge of terrorism," the White House said.

"The President spoke by phone today with Prime Minister Justin Trudeau of Canada to accept Prime Minister Trudeau's condolences for the terrorist attack in Orlando, Florida," the White House said.