At least six persons were killed and more than a dozen went missing after a boat capsized in Bahraich district of Uttar Pradesh, police said on Saturday.The incident took place in the Saryu river at Pipraghat in Ramgaon. The dead include two children.The overcrowded boat was said to have been in a dilapidated condition. Most of the passengers were headed home after an overnight stay at the Matiyari fair, an annual event, a police officer said.Six bodies have been fished out of the water so far and those missing are being searched for by the PAC divers, an official said.