Authorities plan to provide added security measures for the New York City Marathon on Sunday following a deadly terrorist attack in lower Manhattan this week.

"The marathon will go on because New York goes on and it's an important event for all New Yorkers," New York Gov. Andrew Cuomo Andrew CuomoNew York City bus driver knocked out by passenger he told to wear a mask 44 percent of high earners have considered leaving New York City: poll Media's anti-Trump coronavirus spin has real consequences MORE (D) said during a news conference Wednesday.

New York Police Chief Carlos Gomez said that the security measures would include an increased presence of sand trucks and other blocker vehicles meant to shield runners and onlookers from possible attacks.

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The number of rooftop observation teams will also be doubled, while counter-sniper teams will be stationed throughout the city, he said.

Heavy weapons teams will also be stationed across the city, Gomez said, as well as K9 units and counterterrorism officers. Helicopters will surveil rooftops during the race.

More than 51,000 runners are expected to participate in the annual marathon, and another 2.5 million spectators will line the streets during the race, officials said. The marathon is set to take place days after the Tuesday attack, which left eight people dead and put the city on high alert. The New York Road Runners, the group that organizes the annual race, said Tuesday that they "have extensive safety and security measures in place, both visible and behind the scenes," and reserved the right to change their plans if necessary.

Statement from New York Road Runners on the tragedy in Lower Manhattan. pic.twitter.com/R1EuCYNq7C — TCS NYC Marathon (@nycmarathon) October 31, 2017

"We are monitoring the situation closely with our city, state, and federal agency partners, particularly the NYPD," the group said. "For this weekend’s marathon, as with all of our events, the safety and security of our runners, staff, volunteers, and spectators is our top priority."

Cuomo said at a news conference shortly after the attack on Tuesday that city residents would see an increased security presence in the coming days, but noted that there is not believed to be an ongoing threat.

Eight people were killed and 11 others were injured on Tuesday afternoon after a rented truck drove onto a bike path in Lower Manhattan. The suspect, identified as 29-year-old Sayfullo Saipov, then exited the vehicle waving a pellet gun and a paintball gun before he was shot by police and taken into custody.

Updated: 12:36 p.m.