The seven defendants were tried behind closed doors on charges of premeditated murder of government employees, which their lawyers have denied. A Shia opposition official named those sentenced to death as Ali Abdullah Hasan, Qasim Hassan Mattar, Saeed Abdul Jalil Saeed, and Abdul Aziz Abdullah Ibrahim.
He told the AFP news agency that Issa Abdullah Kazem, Sadiq Ali Mahdi, and Hussein Jaafar Abdul Karim were sentenced to life in prison.
Sheikh Ali Salman, president of Bahrain's Al Wefaq, the largest Shia political group in the country, told Al Jazeera that the punishments did not fit the crime."I believe that these sentences should be revised and the international community must intervene to stop this," he said.
Authorities have detained hundreds since martial law was declared last month to quell dissent. On Wednesday, a Bahraini official said 405 detainees had been referred to military courts while 312 have been released. "Sixty-two criminal cases and 343 misdemeanor cases have been referred to the courts of national safety," , Sheikh Fawaz bin Mohammed Al-Khalifa, the head of the Information Affairs Authority, said.