The explosion occurred at around 2.30 am.

The blast shattered window panes and damaged facade of the building, reports said.

No casualty was reported so far.

Greece’s Prime Minister Alexis Tsipras has condemned the incident.

“It was an attack by cowardly and dark forces against democracy itself,” the PM said in a press statement issued from his office as reported by Greek Reporter.

He added that those responsible will not “achieve their goal to terrorize and confuse.” 

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