No one was injured during the incidents which are understood to have caused up to 100-thousand euro in damage to stock.
Efforts to identify the person who started fires at five stores in Cork City are continuing.
Emergency services responded to reports of several small fires at a pharmacy and clothing stores in the city centre at around five o'clock yesterday evening.
No one was injured during the incidents which are understood to have caused up to 100-thousand euro in damage to stock.