While no one has claimed responsibility for the courthouse bombing, many linked it immediately to far-left extremist groups, whose violent attacks against government buildings, police stations and banks have increased since December 2008, when police killed a teenage boy in Athens.
Premda nitko nije preuzeo odgovornost za bombaški napad na sudnicu, mnogi su je odmah povezali s ekstremističkim skupinama krajnje ljevice, čiji su siloviti napadi na zgrade vlade, policijske postaje i banke pojačani nakon prosinca 2008., kad je policija u Ateni ubila tinejdžera.