As they informed us in a message, a DDoS attack is currently taking place on two government networks websites, where they appear to remain at the time of writing offline.
Sites are in the domains primeminister.gov.gr and startupgreece.gov.gr.
Both are subdomains of gov.gr where almost all government websites are hosted.
According to the Powerful Greek Army, the DDoS attack took place (and apparently continues to take place) on cooperation of the Greek hacking team with them @PhantomNations
Below you can see the screenshots shown by DDoS 
To our question why they proceeded to the specific ones attacks the PGA responded:
To see how good protected they have such popular government sites, and they don't have any.
And a screenshot from startupgreece
