Government has refused permission for a home-and-away bilateral hockey series between India and Pakistan on security grounds.A top source in Hockey India today said that they have received a communication from the Ministry of External Affairs asking it call off the bilatarel series. The Pakistan's hockey team was scheduled to tour India next month for five Test matches at Ranchi, Lucknow, Delhi, Mohali and Jalandhar between April 5th to 15th.After Pakistan's visit, the Indian team was scheduled to pay a return visit and play five matches at Lahore, Faisalabad, Karachi and Sialkot from April 23.Pakistan and India last played a bilateral hockey series in 2006 — three matches in each country. Pakistan won three and lost one while the remaining two were drawn.The cancellation of the hockey rubber came close on the heels of an abandoned bilateral snooker series between India and Pakistan earlier this month following Government's objection.