Two stores and one car were torched in the districts of Kipseli and Egaleo respectively early Thursday morning, state-run news agency ANA-MPA reported.
In the first attack, unknown assailants planted two incendiary devices at the entrance of a butcher shop and a store selling alarm systems on Agia Zoni Street, in the central district of Kipseli at 4.25 a.m.
The explosions caused damages to windows and walls, but no injuries.
In a separate incident, an unknown number of suspects used a flammable liquid to set alight a car in Egaleo, western Athens. The vehicle, which was parked at the corner of Edessis and Florins Streets, was destroyed.
Authorities are investigating the incidents.