Bahrain on Thursday sentenced 25 citizens to prison for forming a terrorist group.
They have been revoked of their nationality and are also charged with travelling to Iraq and Iran for weapons and explosives training and the attempted murder of police officers.
The High Criminal Court on Wednesday sentenced 10 of the defendants to life in prison, 10 to a decade behind bars and the other four to jail terms ranging from three to five years.
Authorities on Wednesday also referred to trial seven Bahrainis accused of attacking an oil pipeline to Saudi Arabia in November.
That trial is set for May 10.
The blast cut off the pipeline linking Bahrain's Bapco refinery with oil giant Aramco's main pumping station in neighboring Saudi Arabia's Dhahran province.
Manama in February said it had arrested four men suspected of attacking the pipeline, accusing Iran of training and arming two of them.