Russia has increased security in airports across the country following a suicide bombing Monday at Moscow's Domodedovo Airport that killed 35 people, state news agency Ria Novosti reported.

In response to the attack, Russian authorities ordered security screenings of all passengers and visitors entering the country’s airports as well as screenings of their baggage, Ria Novosti reported.

Domodedovo is Russia's largest airport. It services 77 carriers, according to the airport’s website.

United is the only U.S. carrier that flies to Domedodovo, operating daily flights between Moscow and Washington Dulles.

The U.S. State Department on Monday stated that it does not have confirmation of any U.S. citizen casualties or injuries.

Preliminary reports suggest an explosive device was detonated by a suicide bomber as passengers arrived at Domodedovo's international arrivals gate at 4:40 p.m. on Monday.

Health and emergency officials said 35 people died and that 76 remain in the hospital, many in a grave condition, Ria Novosti reported.

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