The guard was unharmed after about 3kg (about 6.6 pounds) of explosives went off outside his apartment building’s front door

A bomb explosion targeted the home of the president of the Greek association of prison guards early on Saturday morning in the country’s north.

The guard, named Konstantinos Varsamis on the association’s website, was left unharmed after about 3kg (about 6.6 pounds) of explosives went off at 2.10am, police said.

The explosives were placed outside his apartment building’s front door in Sykies, a suburb in the northern city of Thessaloniki, where he lives on the first floor, according to authorities. The blast damaged three apartment buildings, shattering their windows and collapsing a shared wall.

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