"So far 20 persons have been reported to be dead in the boat tragedy," Principal Secretary, Disaster Management department Pratyay Amrit told PTI.
Efforts are on to look for possible survivors and bodies.
Amrit, DIG Shalin and Patna District Magistrate Sanjay Kumar Aggarwal are camping at the river bank, close to which the tragedy occurred, to supervise the rescue operation.
Around 40 people were said to be onboard the country boat when it capsized near NIT ghat in the evening.
More From This Section
A few on the ill-fated boat swam to safety, while some families said their fellow members had gone missing after the accident.
Nine persons have been admitted to Patna Medical College Hospital. The search has been called off for the night due to darkness, officials said.
Family members of the deceased and those missing were seen wailing at the ghat.
Sources said the tragedy was suspected to have been caused by overloading.