The Serbian capital was the target of a series of bomb threats on Monday, police said.
Threats were made against schools, bridges, shopping malls, restaurants, the city zoo and a football match, bringing rush hour traffic to a standstill in Belgrade.
Police said in a statement that no explosive device had been found after more than 90 different searches and it was not immediately clear who was behind the alleged email threats.
Nearly 100 primary schools were evacuated after the threats, along with several restaurants including a McDonald’s outlet and shopping malls, the zoo, the city’s airport, train stations and the water supply company.
The Russian embassy was also the target of a bomb threat, local media report.
A Premier League football match was also postponed as police searched the stadium.
“Even if the threats seem false, we should not take them lightly,” said First Deputy Prime Minister Branko Ružić.
Flag carrier Air Serbia has faced a series of bomb scares on its flights to Moscow in recent months after it was the only European carrier, besides Turkish carriers, to maintain regular flights to Russia despite a Western embargo on flights.
Serbia remains one of the few European countries that has not introduced any sanctions against the Kremlin for its February 24 invasion of Ukraine.
Serbian Interior Minister Aleksandar Vulin claimed that the country was “the target of a special war that comes from different European addresses”.