Mr McCartney said,
““It has been established that people shot and killed on Bloody Sunday were murdered and PSNI have a statutory duty to investigate and bring the perpetrators to justice.
“The decision by the High Court in Britain this morning to stop suspects being brought to the North for questioning is the latest in a long line of impediments put in the way of this investigation.
“The decision doesn’t inspire confidence in the justice system and the PSNI need to be free to investigate these murders in the same way as they would with every other killing.
“Sinn Féin will continue to support the families in their quest for truth and justice.”