A bombing at the busiest airport in Moscow that killed at least 31 and injured 130 is being called a terrorist attack by Russian officials. "From the preliminary information we have, it was a terror attack," Russian President Dmitry Medvedev said of Monday's attack on the Domodedovo Airport in a televised briefing. Medvedev also said that those responsible for the attack would be "tracked down and punished." All Moscow transportation services went on high alert following the attack. Israel canceled all flights to Moscow.