Four persons were killed during a shootout between two rival groups over petty dispute at Pai-Abizar area in Tank district on Tuesday, police said.The clash started when Saeedullah Khan group allegedly started firing at Miran Shah group after failure of talks to settle goats theft dispute.As result of the firing, Saeedullah Khan and Salim Khan died on the spot.The killing infuriated relatives of Saeedullah Khan who chased the fleeing accused Zarman Shah and Miran Shah by intercepting them in Abizar area where exchange of fire took place. During firing which continued for quite some time Zarman Shah and Miran Shah were killed. Police after registering the case have started investigation.