The file photo shows that people mourn the victims of the mass shooting during a memorial service in Orlando, the United States, on June 13, 2016. (Xinhua/Yin Bogu)

WASHINGTON, June 12 (Xinhua) -- The city of Orlando in southeastern U.S. state of Florida on Monday marks the one year anniversary of the Pulse nightclub terror attack, the country's worst mass shooting in which a gunman killed 49 and injured more than 50 others.

Monday is the "Orlando United Day -- A Day of Love and Kindness," the city authorities announced in a statement.

"This day is dedicated to the memory and honor of the 49 innocent lives taken at Pulse, reaffirms the community's commitment to survivors and loved ones, as well as recognizes the global compassion and love displayed in the wake of the tragedy," the statement said.

U.S. Army Sgt. Marie Cobbs, who attended a ceremony at the Pulse early Monday that was only open to survivors and family and friends of those who were killed, said she was too angry to go inside the nightclub.

The police officer "was going to let me in, but I just said no. I just couldn't ... I'm too angry," Cobbs was quoted by an ABC news report as saying.

The early morning ceremony kicks off a full day of services held in honor of the victims and survivors. The major events include a midday service held at the nightclub, and an evening gathering called Orlando Love: Remembering Our Angels.