The accident happened when a pick-up truck carrying the groom’s party of 29 was hit by floods in a remote village in Khyber Agency.
The dead included 18 children and six women.Three people who survived were taken to hospital.
“Rescue operation has been completed, dead bodies of 26 people had been retrieved,” said Rahimullah Mehsud, a local government official of Khyber tribal district, where the incident took place.
Mehsud earlier said rescue workers and residents were facing difficulties as the “area is remote and mountainous”.
Hekmat Khan, another government official, confirmed the new death toll and said that the child victims were aged up to nine years.
The heavy monsoon rains began earlier this month, drenching the Khyber Pakhtunkhwa and central Punjab provinces, which have been badly affected by flooding in recent years that some scientists have linked to climate change.