“The Transportation Security Administration (TSA) and U.S. Customs and Border Protection (CBP) have procedures in place to identify and prevent travel here from Belgium by individuals of suspicion,” said DHS officials in a press release.
The also said the TSA is adding additional security to major city airports across the country.
Rail and transit stations throughout the United States will also see increased security following the attacks.
The DHS stated that they are working closely with state and law authorities, as well as air and transit officials, and the aviation industry in order to increase security.
In New York City, officials ramped up security, although there is no known connection to the Brussels attacks.
— NYPD NEWS (@NYPDnews) March 22, 2016
The Port Authority Police Department increased security at three New York City area airports—John F. Kennedy, LaGuardia and Newark Liberty, as well as bridges, tunnels, and bus terminals.
Anti-terrorist patrols were stationed throughout the trans-Hudson River system and the World Trade Center district.
Bag checking at PATH stations were conducted more frequently in light of the attacks.
The National Guard has also been deployed at JFK and LaGuardia, as well as other locations in New York City, and state police have been assigned to Penn and Grand Central Stations as well as the Queens Midtown Tunnel and the George Washington Bridge.
New York Governor Andrew Cuomo released a statement saying, “I have directed state law enforcement officials to step up security at high-profile locations around the state, including our airports, bridges, tunnels and mass transit systems.”
“Public safety is paramount, and I want the people of this state to know that we are working with all local and federal partners, remaining vigilant and taking all necessary measures to keep New Yorkers safe,” he added.
Officials said there is no known threat to New York, and that the warning level has not been raised by the U.S. Department of Homeland Security.
In Washington D.C. the Metro Transit Police said that they are adding more security as a precaution and conducting additional K-9 sweeps.
No known, specific or credible threat to Metro at this time. Additional K9 sweeps + patrols starting this AM as precaution. #wmata
— Metro Transit Police (@MetroTransitPD) March 22, 2016
Due to the events which occurred in Brussels, Belgium LAX has increased security and visibility of officers at LAX. pic.twitter.com/q9PuNhaHpY
— LA Airport PD (@LAAirportPD) March 22, 2016
Cities worldwide have also taken precautions. Cities in Europe, Denmark, Sweden, Finland, and Norway have ramped up security at major airports.
In Germany, Interior Minister Thomas de Maiziere said they were taking increased security measures at critical infrastructures in the country and along its borders with France, Belgium and the Netherlands.
The Associated Press contributed to this report.