The U.S. Embassy in Kyiv urged U.S. citizens to take refuge on Thursday as Russia stepped up its invasion of Ukraine.
“There are reports of numerous military operations and fighting across Ukraine,” the embassy tweeted. “U.S. citizens who are in Ukraine are encouraged to hide on the spot. Seek shelter immediately if you hear a loud explosion or when sirens sound. “
Ukrainians are fighting for security as fighting intensifies.
Footage on CNN showed a subway platform that serves as an impromptu bomb shelter in Kharkiv, crowded with families and their pets.
Agence France-Presse reports that similar scenes take place in the Kiev metro, when the capital sounded sirens.