A multi-story apartment building in Makhachkala, the capital of Russia's Dagestan region in the Caucasus, collapsed due to flooding, according to the regional office of the Russian Emergency Ministry on Sunday.

Three police officers were killed in a shootout in Makhachkala, the Dagestani interior ministry said, citing preliminary data.

Temporary security restrictions have been imposed at the airports in the cities of Vladikavkaz, Grozny and Makhachkala in Russia’s North Caucasus, the Federal Air Transport Agency said in a statement.