There are about 420 Indian fishermen, including eight children, lodged in the prisons of Karachi, with one of the prisoners being charged with 'murder and terrorism,' a Pakistani media report said.
Among those held, 411 are lodged in the Central Prison Karachi (CPK), while eight children were in the Landhi Jai, leading Pakistani daily The News has reported.
The report came in the wake of the arrest of 117 Indian fishermen earlier this week and the seizure of 13 of their boats.
"One of the Indian prisoners has been convicted for murder and terrorism," the daily quoted unnamed officials as saying.
All the prisoners, with whom the daily spoke, said they were in "very pathetic conditions" and complained that neither India nor the Pakistani government was helping them.
A prisoner, Bhabat, told the newspaper that all the fishermen were facing serious health problems and other hardships. Some of them have appealed to Prime Minister Yousuf Raza Gilani and President Asif Ali Zardari to release them on humanitarian grounds saying they were poor and "unable to fulfill the legal formalities", it said.
Kanjee Raja, another prisoner, said he had not seen his wife and children for several days and was not aware of their whereabouts.