ATHENS, Greece — Greek police arrested a third suspect Monday in connection with an explosion in central Athens last week that authorities have blamed on an alleged aspiring domestic extremist 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.

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

– The Associated Press