He said that it might be the work of an infiltrator.
Mohmand Nasratyar, governor of Arghandab District confirms the incident but does not provide further details.
He said that a delegation has been dispatched to the area to find out more about it.
Fawad Askari, spokesman for the police HQ of Zabul has also confirmed the incident.
He said a number of soldiers have embraced martyrdom in the incident, adding that a delegation was sent from Qalat, the provincial capital, to find out cause of the incident and number of the casualties.
Taliban have claimed responsibility for the attack.
With the martyrs of last night’s attack, at least 38 soldiers have lost lives in similar attacks in southern Afghanistan since the beginning of August.