Seismologist Krešimir Kuk told Croatian media that the earthquake was of magnitude 6.2. He says that the epicenter was between Sisak and Petrinja.

- According to the liberated energy, this earthquake is about thirty times stronger than the one in Zagreb - said Kuk.

As he added, Zagreb is collapsing.

-This earthquake is not surprising, you never know. Those earthquakes yesterday preceded the one today - he said, adding that they believe this is the strongest blow.