CAIRO — Egypt’s highest court on Sunday indefinitely postponed its much-awaited ruling on the legitimacy of the legislative assembly that drafted a new charter last week. The court accused a crowd of Islamists of blocking judges from entering the building, on what it called ‘‘a dark black day in the history of the Egyptian judiciary.’’

Although hundreds of security officers were on hand to ensure that judges of the Supreme Constitutional Court could get into the court, and civilians came and went without any problems, the accusations intensified a standoff between the judges appointed under former President Hosni Mubarak and Egypt’s new Islamist leaders.