Russia began implementing stringent security measures Tuesday in Sochi, one month before the start of the 2014 Winter Olympics. According to CBS News, tens of thousands of Russian police, security agents, rescue workers and army troops are being deployed from the games.

In addition, all vehicles were banned from the area beginning Tuesday excepting those registered in Sochi or with special Olympics passes.

The high security measures are partly due to a violent Islamist insurgency simmering in the nearby North Caucasus region, and concerns increased following two suicide bombings last week in the city of Volgograd, about 400 miles away, the article says. No one has yet claimed responsibility for the bombings.

Last year, the leader of the Islamist insurgency called for attacks aimed at undermining the Sochi Olympics.

All demonstrations or marches will need to be approved by the Interior Ministry, which is responsible for the country’s police force.