A prosecutor charged on Wednesday two people with a criminal offence and a series of misdemeanors in connection to the attacks on the building of the Hellenic American Union (HAU) in Athens.

A 26-year-old man and a 23-year-old woman had been detained by police after a group of people broke the HAU's glass door with sledgehammers and threw flyers inside supporting jailed November 17 terrorist Dimitris Koufodinas on Tuesday.

The prosecutor charged them with the crime of theft and the misdemeanours of disturbing the peace, damaging property, illegally possessing a weapon, causing bodily harm and insubordination.

The incident at the HAU in Athens followed an attack at the institution's premises in Thessaloniki on Monday, where a group of people spraypainted the walls with slogans in support of Koufodinas.