The US President took to Twitter to not only condole the loss in the recent attack, but also to slam the terror outfit.

"In NYC, looks like another attack by a very sick and deranged person. Law enforcement is following this closely. NOT IN THE U.S.A.!" his tweet read.

An ensuing tweet added, "We must not allow ISIS to return, or enter, our country after defeating them in the Middle East and elsewhere. Enough!"

To tighten the security, the US President also said that he has ordered the Homeland Security to set up extreme vetting programme.

"I have just ordered Homeland Security to step up our already Extreme Vetting Program. Being politically correct is fine, but not for this!" he said.

The attacker in the recent attack has been identified as 29-year-old Sayfullo Saipov, an immigrant who came to the US in 2010.

Local reports quoted witnesses as saying that he shouted Allahu Akbar before running over the pedestrians and killing them.

Image: twitter.com/realDonaldTrump