Catherine, Duchess of Cambridge, signs a book of condolence for the Orlando nightclub shooting victims while Prince WIlliam, the Duke of Cambridge, and Matthew Barzun, U.S. Ambassador to London look on at the U.S. Embassy on June 14.
49 people were killed and dozens wounded after a gunman opened fire and took hostages at a gay nightclub in Orlando on June 12.
People hold a candlelight vigil on June 14 in Tokyo to mourn victims of the Orlando shootings.
Nicole Edwards and her wife Kellie Edwards observe a moment of silence during a vigil on June 13 outside the Dr. Phillips Center for the Performing Arts.
Buildings on Brussels' Grand Place are lit up in the colors of the rainbow flag on June 13 to honor the victims of the Orlando shootings.
A series of explosions hit Brussels airport and the Belgian capital's subway on March 22.
People mourn around candles at the Place Trocadero in front of the Eiffel Tower in Paris on June 13 to honor the victims of the Orlando shootings.
A massive series of terror attacks in and around Paris left more than 120 dead across six sites in November.
People gather during a vigil for the victims of the Orlando shootings on June 13.
City Hall is lit in the colors of the rainbow to honor the victims of the Orlando shootings.
A man prays during a vigil for the Orlando victims on June 13 in Bangkok.
A rainbow appears behind the U.S. flag flying at half-staff on top of the Tacoma Dome June 13. Flags across the state were at half-staff Monday to honor the victims of the Orlando shootings.
A defiant fist is raised at a vigil on June 13.
An LGBT activist wears a U.S. flag during a vigil for the Orlando victims at a church in Zurich on June 13.
People pause during a minute's silence in memory of the Orlando victims in the Soho district of London on June 13.
A man looks over an impromptu candle-lit memorial set up in Sydney on June 13.
A person lays flowers at a makeshift memorial for the Orlando shooting victims in front of the Stonewall Inn, where the modern gay rights movement took root, on June 13.
A woman pauses while writing the names of shooting victims in chalk in a park across from the The Stonewall Inn on June 13. An American-born man who had recently pledged allegiance to ISIS killed 50 people early Sunday at a gay nightclub in Orlando, Florida.