The European-Mediterranean Seismological Centre (EMSC) reported that the 3.5-strong quake had the epicentre two kilometres norht-east of Zagreb.
Croatian seismologist Kresimir Kuk said in the meantime for a commercial media outlet that the strength of the quake was 3.4.
The quake was felt in various parts of the Croatian capital city, which suffered extensive damage in a 5.5 strong quake on 22 March. Since then a number of the aftershocks have been felt in Zagreb and its environs.