A suicide bomber killed at least 35 people and injured over 150 people at the busiest airport in Russia on Monday, the state TV informed. The bombing attacked the capital of Russia and carried the marks of militants brawling for an Islamist state in the region of North Caucasus.

President Dmitry Medvedev of Russia promised to track down and punish those who are behind the bombing. The incident occurred during one of the busier late afternoons at Domodedovo airport in Moscow. Some of the people killed were foreigners.

Islamist rebels once declared that they will bring their bombing campaign from North Caucasus to the heartland of Russia during the year prior to the elections for president, saying they will hit transport and economic targets.

They also heightened their threats at the Winter Olympics in 2014, which is scheduled to take place at Black Sea resort town of Sochi, an area where militants consider “occupied.”

Pools of blood spread all over the area outside the arrival halls where, according to Interfax news agency, traces of shrapnel were discovered.

Planes from several countries across Europe had landed from half the hour before the attack occurred. French, Italians and Germans were said to be in the hospitals while two Britains were among the dead, according to investigative committee spokesman Vladimir Markin.

The bomb had been categorized as a terrorist attack, according to the prosecutor’s office. It is the largest since twin suicide bombings on the Moscow metro in March.

The blast was most likely the work of a suicide bomber, state television said. Quoting Markin, state-run RIA said the bomber probably had a belt loaded with explosives.

U.S. President Barack Obama offered Moscow some help as he denounced the outrageous act of terrorism.