Two people have been killed and several injured in three explosions in the city of Vladikavkaz in southern Russia, officials say.
The blasts occurred within five minutes of each other at amusement arcades in the centre of the city.
At least 13 people, most of them young, are said to have been injured in the explosions.
Vladikavkaz, the capital of North Ossetia, is in Russia's restive North Caucasus region near Chechnya.
Russian news agency Ria Novosti said that a man and a woman had been killed, citing North Ossetia health minister Aleksandr Reutov.
One official said the authorities were treating the blasts as terrorism, but another suggested the blasts might be the result of a criminal dispute, AP news agency said.
Vladikavkaz is in the same region as Beslan, where more than 330 people died in 2004 when pro-Chechen gunmen seized hostages at a school.