Hundreds of Russian mercenaries are in the Ukrainian capital of Kyiv with orders to assassinate Ukraine President Volodymyr Zelensky, according to Ukrainian intelligence.

The Ukrainian government learned of a Russian plot to assassinate the president over the weekend and declared a 36-hour “hard” curfew as Ukrainian forces sweep the city to identify and neutralize the would-be assassins, according to The Times of London. Citizens still in Kyiv were warned to stay indoors or risk being “liquidated.”