Protesters in Thailand have returned to the streets to demand the government’s resignation as the parliament discusses an amendment of the country’s constitution and changes to its electoral system.

At least five groups are planning to hold demonstrations across Bangkok on Thursday, calling for Prime Minister Prayut Chan-ocha to quit as well as commemorating the Siamese Revolution that marked the end of absolute monarchy in 1932. Police have warned protesters against gatherings, on the same day the parliament is due to vote on amendments that largely ignore their demands for a major overhaul.

Hundreds of activists marched to the parliament to push for "a constitution that comes from the people,” and rejected the charter that’s part of "the mechanisms leading to the continuation of the current regime.” They issued a call to amend sections relating to the monarchy, which was already rejected by the parliament.