Yemen's Houthi rebels sentence 30 opponents to death for "spying"
The men, mainly academics, professors and students, are members of the Islah Party, the Muslim Brotherhood group in Yemen. They were arrested during a Houthi security campaign in 2016.
The verdicts against the men can be appealed, the official said on condition of anonymity.
Amnesty International condemned the trial as a "mockery of justice," and urged the Houthis to immediately release the 30 men.
Saudi Arabia has been leading an Arab military coalition against the Iran-allied Houthi rebels in Yemen for more than four years in support of the exiled internationally recognized government of Yemeni President Abd-Rabbu Mansour Hadi.