Major U.S. transportation hubs were placed on alert on Tuesday and Denver International Airport briefly evacuated part of its main terminal in a false alarm there hours after suicide bombings in Brussels killed at least 30 people.
Despite public safety concerns unleashed by the violence in Belgium’s capital, U.S. Homeland Security Secretary Jeh Johnson said the agency had no intelligence that would point to a similar attack being plotted against the United States.
But the State Department issued a travel alert warning U.S. citizens in Europe to avoid crowded places, to be vigilant when in public or using mass transit and to exercise extra caution during religious holidays and at large festivals and events.
“Terrorist groups continue to plan near-term attacks throughout Europe, targeting sporting events, tourist sites, restaurants, and transportation,” it said in a statement.
The Brussels bombings reverberated on the 2016 U.S. presidential campaign trail, with Democratic contender Hillary Clinton declaring that more needed to be done to confront the Islamic State militants who claimed responsibility for the attacks.
The Republican front-runner in the White House race, Donald Trump, called again for tighter border security and suggested U.S. intelligence services could use torture to head off future attacks.
Some of the country’s busiest airports and other transportation facilities were placed on heightened security status, as illustrated by a greater law enforcement presence.
Large numbers of uniformed police officers and National Guard troops dressed in battle fatigues and carrying rifles patrolled New York’s John F. Kennedy International Airport. Several U.S. carriers – Delta Air Lines Inc (DAL.N), United Continental Holdings Inc (UAL.N) and American Airlines Group Inc (AAL.O) – said they canceled or rerouted flights as a result of the Brussels attacks.
At midafternoon, authorities at the Denver airport evacuated two levels on the west side of the main terminal after several packages that appeared suspicious were spotted near ticket counters, airport spokeswoman Stacey Stegman said.
Denver police, FBI and U.S. Transportation Security Administration officers converged on the airport, but the packages were ultimately deemed to pose no threat, and the terminal was fully reopened within two hours.
Several airlines were affected by the scare, including American Airlines, Aeroméxico, Air Canada, Lufthansa and British Airways, the airport said.
U.S. President Barack Obama ordered flags flown at half-staff in memory of the victims in the Belgium attacks.
The State Department said an undetermined number of U.S. citizens had been injured in Brussels but none were killed. Three Mormon missionaries and a U.S. Air Force member and his family were among those hurt.
The Obama administration also was expected to impose tighter security measures at U.S. airports following the Brussels Airport bombings, which occurred in a public hall outside of the security check area.
U.S. Representative William Keating of Massachusetts, senior Democrat on a House subcommittee on terrorism, said the suicide bombings illustrated the difficulty of protecting “soft targets” outside tightly controlled security cordons.
“The targets aren’t going to be just getting on the plane itself, but the airport in general,” he said in a phone interview.
Obama addressed the attacks briefly in a speech in Havana on his historic visit to Cuba, vowing to support Belgium as it hunts for those responsible.
“This is yet another reminder that the world must unite. We must be together regardless of nationality or race or faith in fighting against the scourge of terrorism,” Obama said. (Courtesy Reuters)