Thailand's constitutional court has rejected the general elections held last month.
It says the vote was unconsitutional because elections weren't held in several constituencies.
The announcement is a major setback for Prime Minister Yingluck Shinawatra's government.
The ruling party has been trying to stop the opposition protests that first started in November, over plans for a new amnesty law.
Al Jazeera's Zeina Khodr reports from Bangkok.
