By Gina Cherelus

NEW YORK (Reuters) - New York City police will send more officers to safeguard Sunday's annual gay pride parade, boosting security at the event that is expected to attract more than 1.6 million spectators just days after the June 12 mass shooting in Orlando, city officials said on Thursday.

Anticipating the largest pride parade New York City has seen since the event's inception in 1970, Mayor Bill de Blasio said that although there was no specific threat directed against the highly anticipated event, the city's police will take extra precautions.

"We have been vigilant every day since 9/11," the mayor told a news conference. "This year, we have an obligation to our nation in the wake of Orlando to show what pride and inclusion looks like."

The parade begins at noon in Manhattan and will include more than 2,000 participants and 85 floats. Less than two weeks earlier, a gunman claiming to be an "Islamic soldier" opened fire and killed 49 people at gay nightclub in Orlando.

"Out of precaution, we are increasing the size of police detail this year with some degree of focus that we might not have had in years past with issues of terrorism, certainly in light of the events in Orlando," said Police Commissioner Bill Bratton.

The New York Police Department will have more officers using radiation detection devices, explosive-detection K-9 dogs and area cameras to monitor the parade.

There will also be radiation helicopters to monitor crowds and traffic, individual officers observing from rooftops, officers stationed within the city's transit system and water vessels to patrol events taking place along piers near the Hudson River.

The parade, hosted by the NYC Pride organization, will begin at 36th Street and Fifth Avenue and end in Greenwich Village, home of the Stonewall Inn bar which is known as the birthplace of the gay rights movement.

"Our hearts are certainly still heavy from the incidents in Orlando," said NYC Pride co-chair David Studinkski, who encouraged members of the community to join the parade on Sunday.

"The worst thing that we can do as a community is to hide," Studinkski said. "Many of us started in closets and the last thing that we should do is go back into them."

(Reporting by Gina Cherelus; Editing by David Gregorio)