Full coverage: Premier Li Attends UN Conferences, Visits Canada and Cuba

Security has been tightened around the UN Headquarters amid the gathering of world leaders. Terror attacks in New York and New Jersey had marred the lead-up to the meetings.

Police stand guard at a street near the United Nations headquarters in New York, the United States on Sept. 19, 2016. Security has been enforced in New York as a series of high level meetings are held at the UN Headquarters since Monday. (Xinhua/Wang Ying)

1,000 more uniformed personnel have been added to an already-heavy security force. They have been deployed in Midtown Manhattan and areas near the UN.

Surveillance near the UN headquarters has also been heightened. Earlier on Monday, the police investigated a suspicious package, which turned out to be no threat to the public.