Detective Hubert Reyes said the New York Police Department is responding to multiple 911 calls to report a man with what appears to be a rifle on East 42nd Street and 1st Avenue, near the United Nations headquarters in New York.
A law enforcement official told CNN that emergency services units are talking to the man who still appears to have the gun.
Two law enforcement officials said the man was seen muttering to himself and also had what appeared to be a briefcase.
The bomb squad responded as a precaution, the two sources said.
“We have closed the building due to police activity taking place outside the UN in front of our gates,” Stephane Dujarric, a UN spokesperson told CNN.
“Everyone is in the building at the moment and the complex is closed,” he said.
An internal message was run from the UN Security Service that says:
“UNDSS would like to report that there is ongoing police activity on First Avenue between 42nd and 43rd Streets.”
“All staff and delegates at United Nations Headquarters are hereby requested to take shelter in their place.”
“The authorities of the host country are currently on site. The Department of Security and Safety is monitoring the situation and will update it accordingly.”
The meeting of the UN Security Council continues at the present time.
This is an evolving story and will be updated.
CNN’s Brian Gingras contributed to this report.