Greek police arrested a third suspect Monday in connection with an explosion in central Athens last week that authorities have blamed on an aspiring domestic extremist communist group.

The 30-year-old woman surrendered to Greek authorities Monday at Athens International Airport after being located in Switzerland, authorities said. 

The Oct. 31 blast gutted a third-floor apartment in the central Ambelokipi neighborhood, killing a 36-year-old man believed to have been assembling an explosive device. A 33-year-old woman was severely injured and remains hospitalized under police guard. A 31-year-old male suspect surrendered to authorities.

“It was a monstrous bomb with concentrated explosive material,” Minister of Citizen Protection Michalis Chrisochoidis told private Skai television. “It would have caused great destruction because it was very powerful.” The apartment block has been declared uninhabitable due to blast damage.

Chrisochoidis said those allegedly involved were young people who appeared to aspire to become a new generation of domestic terrorists in Greece.

Anti-terrorism units searching the blast site, three additional locations, and a vehicle seized two handguns with magazines, digital devices, disguise materials including wigs and rubber masks, and handwritten diagrams.

Greece has a history of far-left extremism dating to the 1970s, with militants carrying out multiple bombings and assassinations, though major groups have been dismantled.

Recent years have seen reduced activity, with the last significant incident occurring in December 2023 when police defused a bomb at riot police headquarters following an anonymous warning.

“I think we are dealing with an attempt of some young people who are aiming to become a third generation of terrorism in Greece,” Chrisochoidis said.

The intended target and timing of the planned attack remain under investigation. All three suspects – as well as the man killed in the blast – are Greek nationals.