An explosion believed to be from a bomb ripped through a mail office Friday, killing six people and injuring at least seven others, police reported.

The blast also damaged cars parked outside the office, located on the ground floor of a building that also houses an appeals court in this southwestern port city.Fire officials in the city 110 miles west of Athens said the explosion heavily damaged the office of Air Courier Services, killing four men and two women believed to be customers who had brought in packages to send.