A record 175 states sign the United Nations climate agreement in New York on opening day. The agreement will enter into force once 55 countries representing at least 55 percent of global emissions formally join it.
Former New Zealand prime minister Helen Clark is running for Secretary-General of the United Nations, to succeed Ban Ki-moon whose second term expires at the end of this year. Clark, who is the first non-European and fourth woman among the eight announced candidates, was prime minister for nine years (1999–2008) and has been Administrator of the United Nations Development Programme since April 2009. The United Nations Trusteeship Council will begin preliminary meetings with candidates next week in New York City.
The FBI's Joint Terrorism Task Force, United States Secret Service and New York City Police Department are investigating a letter containing a suspicious white powder and a threatening note which was sent to the home of Eric Trump, son of Donald Trump, in New York City. The handwritten note within the letter said: "If your father does not drop out of the race, the next envelope won't be a fake." It was signed "X".
A Turkish Airlines plane flying from New York City (U.S.) to Istanbul, Turkey, is diverted to Halifax, Nova Scotia, Canada, after authorities received information of a bomb threat. All 256 passengers and crew are safe. The flight (Turkish Airlines TYH2-TK2) left JFK International Airport at 9 p.m. Saturday and landed just before 1 a.m. Sunday at Halifax Stanfield International Airport. The Royal Canadian Mounted Police is investigating.
Dr. Craig Spencer, a Doctors Without Borders volunteer, was declared free of the Ebola virus and released from a New York City hospital. His was the last Ebola case being treated in the United States.
The United Nations estimates that four million people have become homeless as a result of the 2010 Pakistan floods; Secretary-General of the United Nations Ban Ki-moon, speaking in New York, states that the floods are a "slow-motion tsunami" as he calls for more funds to assist those affected.