The world was rocked Sunday by a tragic massacre at a gay nightclub in Orlando, Florida, where 50 people were killed in what's now considered the worst mass shooting in U.S. history, and what some are calling the worst terror attack on American soil since 9/11.
Omar Mateen, the gunman who authorities say had pledged allegiance to ISIS, was killed in a shootout with SWAT team members.
Here are 12 images of the world in mourning:
A pride flag stands a half mast during a memorial service in San Diego, California on June 12, 2016, for the victims of the Orlando nightclub shooting. (Sandy Huffakera/AFP/Getty Images)
A rainbow flag flies at half mast on the Space Needle in Seattle, Washington on June 12, 2016, in honor of the victims of the nightclub shooting in Orlando. (Omar Torres/AFP/Getty Images)
A bunch of roses is held by a man in front of the US Embassy in Berlin on June 13, 2016, as people pay tribute to the victims of the Orlando killing. (John Macdougall/AFP/Getty Images)
Mourners hold an LED sign reading "Dallas To Orlando" as they march during a vigil in Dallas, Texas, on June 12, 2016, for victims of the attack at Orlando's Pulse Nightclub in Orlando, Florida. (Laura Buckman/AFP/Getty Images)
Ryan Gibson, left, embraces Tabor Winstead during a vigil for the victims of the Orlando shooting on Sunday, June 12, 2016 at the Legends Club on Hargett Street in downtown Raleigh, North Carolina. (Robert Willett/The News & Observer via AP)
Donors line up outside OneBlood Blood Donation Center in Orlando, Florida, on Sunday, June 12, 2016. The center was flooded with donors after a mass shooting early Sunday morning at a gay nightclub, Pulse, in Orlando. (Loren Elliott/Tampa Bay Times via AP)
FBI agents investigate near the damaged rear wall of the Pulse Nightclub where Omar Mateen allegedly killed at least 50 people on June 12, 2016, in Orlando, Florida. (Joe Raedle/Getty Images)
A rainbow flag is held up during a vigil after the worst mass shooting in U.S. history at a gay nightclub in Orlando, Florida, in front of the White House in Washington, June 12, 2016. (Joshua Roberts/Reuters)
A woman cries and holds flowers in front of a makeshift memorial to remember the victims of a mass shooting in Orlando, Florida, in New York, Sunday, June 12, 2016. (AP Photo/Andres Kudacki)
Flowers left outside the U.S. Embassy in Moscow in memory of those killed in the night club shooting in Orlando. (Evgenya Novozhenina/Sputnik via AP)
People attend a vigil in front of the White House in Washington, D.C., on June 12, 2016, in reaction to the mass shooting at a gay nightclub in Orlando, Florida. (Andrew Caballero-Reynolds/AFP/Getty Images)
A mourner holds up an American flag and a candle during a vigil for a fatal shooting at an Orlando nightclub, Sunday, June 12, 2016, in Atlanta. (AP Photo/David Goldman)
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