MOSCOW (AP) -- An explosion ripped through the international arrivals hall at Moscow's busiest airport on Monday, killing 31 people and wounding about 130, officials said. The Russian president called it a terror attack.
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The state RIA Novosti news agency, citing law enforcement sources, said the mid-afternoon explosion at Domodedovo Airport may have been caused by a suicide bomber.

Amateur video posted on YouTube showed the terminal engulfed by smoke, with a pile of bodies in one section and other bodies scattered around the floor. Luggage lay strewn across the ground and there were several small fires. A dazed man in a suit pushed a baggage cart through the carnage.

"From the preliminary information we have, it was a terror attack," President Dmitry Medvedev told officials in a televised briefing.

He ordered authorities to beef up security at Moscow's two other commercial airports and other key transport facilities, including the subway system, the target of past terror attacks. He said the explosion demonstrated that security regulations had been breached.

Medvedev postponed his planned Tuesday departure for the World Economic Forum in Davos, Switzerland, where he was to give the opening address on Wednesday.

Although there have been repeated attacks on the Moscow subway and on Russian trains - most blamed on Chechen militants - the bombing Monday was the first involving a Russian airport since 2004.

Sergei Lavochkin, who was waiting in the arrivals hall for a friend to arrive from Cuba, said he saw emergency teams carrying bloodied people out of the terminal.

"I heard a loud bang, saw plastic panels falling down from the ceiling and heard people screaming. Then people started running away," Lavochkin told Rossiya 24 television.

Mark Green, a British Airways passenger who had just arrived at the airport, told BBC television he heard the huge explosion as he left the terminal.

"Literally, it shook you," he said. "As we were putting the bags in the car a lot of alarms ... were going off and people started flowing out of the terminal, some of whom were covered in blood."

"One gentleman had a pair of jeans on that was ripped and his thigh from his groin to his knee was covered in blood," he added.

Green said thousands of people were in the terminal at the time of the blast.

Sofia Malyavina, a spokeswoman for the Social Development and Health Ministry, said 31 people were killed and about 130 were wounded. She said 56 ambulances were sent to treat the victims.

"The airport is filled with smoke," she said on Rossiya 24.

Built in 1964, Domodedovo is located 26 miles (42 kilometers) southeast of the center of Moscow and is the largest of the three major airports that serve the Russian capital, serving over 22 million people last year. It is generally regarded as Moscow's most up-to-date airport, but its security procedures have been called into question.

In 2004, two suicide bombers were able to board planes at Domodedovo by buying tickets illegally from airport personnel. The female bombers blew themselves up in mid-air, killing all 90 people aboard the two flights.

Currently 77 airlines offer regular flights to Domodedovo, serving 241 international and national routes, according to airport's website.

The airport insists that security is one of its top priorities, claiming on its website that its "cutting-edge operations technology guarantees the safety of passengers' and guests' lives."

Terrorists have previously targeted other transportation centers in Moscow.

Twin blasts in the subway last March killed 39 people and wounded more than 60 people. Chechen rebel leader Doku Umarov claimed responsibility for that attack, warning Russian leaders that "the war is coming to their cities."

In December 2009, Chechen rebels claimed responsibility for blowing up a high-speed train between Moscow and St. Petersburg, an attack that killed 26 people and injured scores.

NATO Secretary-General Anders Fogh Rasmussen said he was "deeply disturbed" by the reported terror attacks.

"I strongly condemn it," he said on Twitter. "NATO and Russia stand together in the fight against terrorism."

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AP writers Vladimir Isachenkov and David Nowak in Moscow and Raphael G. Satter in London contributed to this report.