A unit of Greek counter-terrorism officers are in Cyprus as part of a broadening investigation into the murder of two members of the ultra-right Golden Dawn outside the party's offices in Neo Irakleio, north of Athens, Kathimerini has learned.

According to sources, a Greek police delegation has been in Cyprus, where 30-year-old Dimitris Mamalikopoulos is on trial for the murder of five people in the resort of Aghia Napa in June 2012. Officers are aiming to glean insights from the 30-year-old, who is believed to be linked to anti-establishment activities in Greece in recent years, Kathimerini understands.

According to unconfirmed reports, the 30-year-old has been linked to an armed attack on the police precinct of Aghia Paraskevi, north of Athens, in October 2009. That attack was claimed by a group calling itself the Organization for the Protection of the People's Struggle (OPLA).