In the first incident, two persons were killed after two rival groups exchanged fire over an old enmity in Khwazakhela area of Swat district, police said.
An investigation has been launched into the incident.
Meanwhile, in another incident two persons were killed and a woman was injured when rival groups exchanged fire over a land dispute in Swabi district of Khber Pakhtunkhwa.
The injured woman was shifted to a nearby hospital, police said.