A general view of the Russki Gorki Ski Jumping Center in Krasnaya Polyana near Sochi
A general view of the Russki Gorki Ski Jumping Center in Krasnaya Polyana near Sochi January 21, 2014. Sochi will host the 2014 Winter Olympic Games from February 7 to 23. REUTERS/Alexander Demianchuk
A general view of the Russki Gorki Ski Jumping Center in Krasnaya Polyana near Sochi January 21, 2014. Sochi will host the 2014 Winter Olympic Games from February 7 to 23.

At least six countries participating in the Sochi Olympics received threat mails written in Russian. The letter, which arrived on Wednesday, asked the individual countries not to take part in the game, threatening them with terrorist activities. The Olympic authorities, on the other hand, refuse to take these letters seriously.

Reuters reports that the assurance from the Russian authorities was not enough for Hungary, Germany, Italy, Slovakia and Slovenia to issue warnings. The other country which also confirmed the receipt of such a letter via email is the United States. The European countries that received the threat are apparently feeling nervous about the security arrangements at the Olympics.

Canada, in the meantime, asked its people who are visiting Sochi during the Olympics to exercise "caution." The Canadian government issued an advisory related to travel on its Web site on Tuesday. Canadian tourists were warned against using public transport in Sochi. People were also cautioned against attending any event where a large group of crowd would be present. CTV News reports that people have also been instructed to "avoid demonstrations," follow local authorities' advice and have a check on local developments. The government has also asked people to make their travel arrangements from reliable sources only.

Only in December, a suicide bombing attack in southern Russia killed at least 34 people. Islamist terrorists have been quite vocal against Russia hosting the Winter Games. In fact, there is already a hunt going to on to arrest a "Black Widow" - a woman suicide bomber - who has plans to engage in atrocious activities in Sochi itself.

The first letter was received in the Hungarian capital Budapest. The threat mail says that people who attend the Olympics hold the possibilities to be "blown up." Russian authorities, on the contrary, insisted that the letter were sent from non-Russian sources. The International Olympic Committee seems confident about the security arrangements at the games. Russian President Vladimir Putin spoke with U.S. President Barack Obama over the phone regarding security matters on Tuesday.