Myanmar security forces fired gunshots as they carried out overnight raids in the main city Yangon after breaking up the latest protests against last month’s coup with tear gas and stun grenades.

The Southeast Asian country has been plunged into turmoil since the military overthrew and detained elected leader Aung San Suu Kyi on Feb 1. Daily demonstrations and strikes have choked business and paralysed administration.

There were sporadic protests across Myanmar on Saturday and local media reported that police fired tear gas shells and stun grenades to...