Greek authorities have made a fourth arrest in the investigation into a series of arson attacks in Thessaloniki linked to the killing of Vagia Nestora, marking the latest development in the ongoing case.

According to reports, an investigating judge issued an arrest warrant for a suspect believed to have collected the keys to a house on Papadiamanti Street that investigators consider a safe house connected to the case.

The suspect was arrested shortly after the warrant was issued.

Authorities say the individual came under suspicion after being identified by a 24-year-old suspect who had already been arrested as part of the investigation. His statement reportedly prompted investigators to move quickly, leading to the latest arrest.