Four people were killed and several injured Wednesday in an bomb blast in central Serbia, the national television RTS said, dpa reported.
The explosion was was apparently triggered by a man arguing with his former wife at a bus stop in Duboka, 130 kilometres southeast of Belgrade.
When people at the bus stop tried to help the woman, the attacker activated a bomb, killing his wife, two bystanders and himself, the report said.
Police confirmed the incident and deaths, but would disclose further details during the investigation.
Weapons and hand grenades brought illegally after the Balkans war of the 1990s still surface in violent incidents and police raids.