MOSCOW, January 29. /TASS/. Four flights from Moscow’s Vnukovo (VKO) and Sheremetyevo (SVO) airports were delayed for over three hours over anonymous bomb threats, a source in emergency services told TASS Friday.

"Emails arrived to the mailboxes of Vnukovo and Sheremetyevo airports, containing messages of explosive devices allegedly planted in four planes departing from Moscow: to Anadyr, St. Petersburg, Magadan and Vladivostok," the source said.

All planes were inspected, but no explosives were found. Two men who sent the letters were not registered to any flight. The planes took off from Moscow with a delay of over three hours.