A day after at least one suicide bomber murdered 35 people and injured more than 100 more in a Moscow airport, Russian President Dmitry Medvedev said the attack "shows that there were clearly breaches in security" at the airport -- including vulnerabilities American transportation officials are scrambling to address halfway around the world.
Medvedev said in a statement today that tougher security legislation had been created following previous terrorist attacks on Russian transportation hubs, "but unfortunately -- and that is our biggest problem -- we do not always enforce even the most important legislation.
"The airport is good, everyone recognises that, it is new and modern. But what has happened shows that there were clearly breaches in security, and everyone who makes decisions here, including the airport management, will answer for this," he said. "This is an act of terror. This is grief. This is a tragedy."
In a meeting with Russia's security service, the FSB, Medvedev said security at the airport had slipped into a state of "simply anarchy."
The attack, which has not been claimed by any group, took place in the arrivals hall of Domodedovo airport -- a space that, like in American airports, is open to the public and not subject to security screening.
CLICK HERE to see raw video of the explosion, as captured by security cameras.
Just hours after reports of the attack emerged, the U.S. Transportation Security Administration said that passengers traveling through U.S. airports "may continue to notice unpredictable security measures," including some before they reached official security checkpoints.
"We are monitoring the tragedy at Moscow's Domodedovo airport. As always, we are working with our international partners to share information regarding the latest terrorist tactics and security best practices," the TSA said in a statement Monday. "Passengers may continue to notice unpredictable security measures in all areas of U.S. airports, including before the checkpoint. These measures include explosive detection technology, canine teams and Visible Intermodal Prevention and Response (VIPR) teams, among other measures both seen and unseen."
One of the most controversial of those "unseen" measures is a program called SPOT, instituted in 2006, which relies on thousands of "Behavior Detection" officers who are trained to identify deception in potential flyers. The Government Accountability Office has criticized the $212-million federal program, asserting it is based on unproven behavioral science and said at least 17 known terrorists have slipped through as many as 23 U.S. airports running the SPOT program without detection.
CLICK HERE to read ABC News' full report on the SPOT program.
"Every airport in the world, including every airport in the United States, has virtually no security until you get to the security checkpoint," said Richard Clarke, an ABC News consultant and former White House counter-terrorism official. "Very large parts of all airports are inherently insecure."
The blast erupted in the arrivals area of the Domodedovo airport at 4:40 p.m. Moscow time Monday. In addition to the 35 dead, another 130 were injured in what investigators called a suicide bombing at the country's busiest airport.
Evgeny Khorishko of the Russian Embassy in Washington, D.C., told ABC News Monday it was "too early to say" who may have been responsible.