Five persons, including four tourists from Gujarat, were killed when their taxi collided with a mini-truck at Goa Velha village near Panaji, police said today.The tourists, in their early 20s and all from Surat in Gujarat, were proceeding to Panaji in a taxi when theirvehicle dashed against a mini truck coming from front near Zuari bridge at around 9.19 PM, a few metres away from Goa Velha police station.