Sri Lanka on Friday denied refusing visas to a delegation from an international human rights group ahead of a Commonwealth summit in Colombo, saying its permission had not been sought for the overseas visitors. Sri Lanka hosts the biennial Commonwealth Heads of Government meeting next week and human rights groups have urged a boycott by leaders to put pressure on the government, which faces allegations of extra-judicial killings, harassment of minorities and the detention of politicians and journalists. On Thursday, the International Bar Association's Human Rights Institute (IBAHRI) accused Sri Lanka of denying entry to its delegation, including the United Nations Special Rapporteur on the Independence of Judges and Lawyers. Sri Lanka's external affairs ministry said the country's Bar Association, which invited the delegation, had not followed the necessary procedure of securing the ministry's agreement for a conference involving international participants.