52,000 athletes from more than 125 countries will compete in the New York City Marathon this Sunday.

"I think it will be a great day, it's great to be here in New York, the course is really neat going through all the boroughs," said Daniel Romanchuk, the 2018 men’s wheelchair division winner.

Last year, Daniel Romanchuk was the first American to win the men's wheelchair division and the youngest.

"We'll see what happens, it's not over until everyone crosses the finish line," said Romanchuk.

“I feel like this is a super connection to New York City,” said Allie Keifer, the Top Ten Finisher of 2017 & 2018 from Long Island.

“This year's marathon will be another hugely successful event as it is every year,” said Police Commissioner James O’Neill.

Just after the athletes held their media availability in central park, law enforcement held theirs in the Joint Operations Center or JOC, Police Headquarters. Hundreds of law enforcement officers from the city, state and federal government will monitor more than 500 cameras along the race route and coordinate security measures for the marathon.

“The entire perimeter of the marathon will be secured will be using over 100 sand trucks over 500 blocker cars and our concrete block will be deployed almost 200 pieces of that,” said Jim Waters of the NYPD.

Late Saturday night Police will start shutting down streets surrounding the 26.2 mile route. And on Sunday, thousands of officers including members of the bomb squad will be deployed along with K-9's, helicopters and drones.

"There's no specific credible threats against the parade, the marathon or the city in general," said O’Neill.

But to be on the safe side, Chemical, Biological Nuclear and Radiation Detection Equipment will be activated.

The NYPD says it’s also monitoring the activity of terror groups after the U.S. killed the leader of the Islamic State Terror Group last weekend.

“As of Monday of this week we were up to 40 different propaganda pieces from ISIS into different chat rooms and message boards calling on attacks for various targets including images of New York City. This is a high security operation for us anyway,” said Jonathan Miller.

Again, no credible threats exist for the event, but the NYPD asks the public to help with security. If you see something, cops say it's your obligation to say something. There will be thousands of police on the street.