The Turkish trial of dozens of suspects charged over November's suicide attacks has been halted indefinitely.
The suspects' lawyers successfully argued the court had no validity
Defence lawyers claimed Istanbul's State Security Court was not fit to hear the case as it was recently abolished in pro-EU government reforms.
Prosecutors later announced they agreed. The full trial cannot now start until parliament creates a new court.
More than 60 people died in the blasts, which targeted two synagogues, the HSBC bank and the British consulate.
Consul General Roger Short was among the dead.
The defence lawyers made their successful plea within hours of the case getting under way. The procedural hearings will continue for several days even though the trial itself will not go ahead.
Twelve suspects appeared at the initial court hearing on Monday, but a total of 69 people are due to be brought to court over the next five days.
The Aksam daily newspaper has quoted Turkish Justice Minister Cemil
Cicek as saying a law establishing new criminal courts would be
passed within a fortnight.
The British consulate was among the buildings targeted
The State Security Court, which handles terrorism and other serious crimes, was abolished in constitutional changes urged by Brussels as part of Turkey's campaign for EU membership.
The first 12 suspects to appear on Monday were surrounded by photographers after arriving in court, as journalists got their first glimpse of the suspects.
The BBC's Jonny Dymond says most of the defendants stared straight ahead, but one pulled his jacket over his head so as to avoid identification.
The two synagogues were attacked with car bombs on 15 November. Five days later, the HSBC bank headquarters and the British consulate were targeted with lorry bombs.
A local paramilitary group called Hezbollah is believed to have been responsible for planning and organising the bombings, but the Turkish police and government say they have evidence of the involvement of al-Qaeda at a high level.
In their indictment, prosecutors request life sentences for five suspects who they say played direct roles in the bombings.
The other 64, accused of being low-level operatives, sympathisers and assistants. could face much shorter sentences.
The suspects now face an indefinite wait for their trial
Several suspects alleged to be ringleaders, however, remain at large.
They include Habip Aktas, the alleged head of the Turkish al-Qaeda cell who is said to have given the order for the Istanbul bombings.
The indictment says the group had initially planned to attack an American airbase in south-eastern Turkey and an Israeli passenger ship on the country's Mediterranean coast.
But plans were dropped, apparently because of tight security.