A Pakistani prison official Wednesday accused India of delaying his country's plans to release 100 Indian fishermen by failing to make timely travel arrangements for them. Prime Minister Yousuf Raza Gilani ordered Pakistan to hand over the fishermen on Christmas Eve as a "gesture" to the nuclear-armed rival, more than a year after relations seriously deteriorated following the Mumbai attacks. The South Asian neighbours frequently seize each other's fishermen, accusing them of violating their respective zones in the Arabian Sea. Prison authorities of Karachi invited journalists to attend a send-off ceremony for the Indians but the detainees were instead told they would not be leaving as planned, an AFP photographer said. "The Indian government has informed the Pakistani interior ministry that they could not make arrangements to receive the fishermen on December 24," the deputy superintendent of Karachi jail, Shakir Shah, told AFP. "They said a new date will be communicated very soon," he said. Pakistani witnesses said some of the detainees chanted slogans against their government, saying they were "disheartened" by the news. Authorities in Pakistan estimate that nearly 200 Pakistani fishermen are languishing in Indian jails. Indian authorities say nearly 500 Indian fishermen are in Pakistani prisons.