At least two persons were injured in an explosion that took place near the public gathering to be attended by Awami National Party chief Asfandyar Wali Khan.
According to the police, the blast occurred in the parking of Wali Khan Sports Complex.
According to the police, the low-intensity blast was caused by a remote-controlled device.
Khyber Pakhtunkhwa Chief Minister Amir Hyder Khan Hoti was also expected to address the public gathering.
The investigations into the incident have been started.