Security forces in Myanmar used violence on Monday against demonstrators who sought to celebrate last week’s formation of the National Unity Government (NUG) to serve as an alternative to the military junta that has held power since a February coup, Reuters reported.

Myanmar media and posts on social networks said the violence was especially intense in Myingyan, a town in central Myanmar. Unconfirmed reports on social media said at least one person was killed there Monday.

Marches were held in Mandalay, the country’s second biggest city, and elsewhere to show support for the National Unity Government announced Friday by protest leaders. Security forces reportedly broke up a march at dawn in Mandalay that included Buddhist monks.