(Reuters) - Ousted Myanmar leader Aung San Suu Kyi appeared at a court hearing via video conferencing on Monday as supporters marched in several towns and cities in defiance of a crackdown after the bloodiest day since the Feb. 1 military coup. Police fired tear gas and stun grenades to disperse hundreds of protesters in the main city of Yangon on Monday, witnesses said. They later combed through side streets firing rubber bullets and at least one person was hurt, media reported. In an evening address on state television, army chief Senior General Min Aung Hlaing said protest leaders and “instigators” would be punished. The army was also investigating financial abuse by the civilian government, he said. Suu Kyi, 75, looked in good health during her appearance before a court in the capital Naypyidaw, one of her lawyers said. Two more charges were added to those filed against her after the coup, she said. “I saw Amay on the video, she looks healthy,” lawyer Min Min Soe told Reuters, using an affectionate term meaning “mother” to refer to Suu Kyi. “She asked to meet her lawyer.” The Nobel Peace laureate, who leads the National League for Democracy (NLD), has not been seen in public since her government was toppled and she was detained along with other party leaders. ‘SEVERE ACTION’ Myanmar has been in chaos since the military seized power after alleging fraud in a November election that the NLD won in a landslide, with daily protests getting increasingly violent as police and troops try to stamp them out. In his speech, read out by a newsreader on state-run MRTV, Senior General Min Aung Hlaing said action would be taken against civil servants refusing to work for the junta. He said the military was investigating what he called corruption by the civilian government, accusing the authorities of misusing money meant for COVID-19 prevention efforts. “The respective ministries are working to find out such financial abuse,” he said, adding that action would be taken against organizations where foreign currency funds were found. He said a committee formed by ousted lawmakers from the civilian government, which has announced the formation of a government-in-exile, was illegal and anyone associated with it would be punished. The junta has promised a new election but not set a date. On Monday, the Committee Representing Pyidaungsu Hluttaw, whose name uses the Burmese word for the Myanmar parliament, declared the junta a terrorist group and condemned the violence against protesters as a “declaration of war on unarmed civilians”. Slideshow ( 5 images ) On Sunday, police fired on crowds in several places, killing 18 people, the United Nations human rights office said. A committee representing lawmakers elected last year said 26 people were killed but Reuters was unable to verify that. “We have to continue the protest no matter what,” Thar Nge said after tear gas volleys from the police forced him and others to abandon a barricade in a Yangon street. The military has not commented on Sunday’s violence and police and military spokesmen did not answer calls. The state-run Global New Light of Myanmar newspaper warned that “severe action will be inevitably taken” against “anarchic mobs”. Demonstrators marched on Monday in the northwestern town of Kale holding up pictures of Suu Kyi, and live video on Facebook showed a crowd in the northeastern town of Lashio, chanting slogans. Police and soldiers later raided a church in the town and detained 11 people, a church group said. Slideshow ( 5 images ) After nightfall, a journalist for the Democratic Voice of Burma live-streamed security forces outside his apartment in the coastal town of Myeik, where he had been filming protests. “They are shooting,” he cries out, appealing to neighbours for help as sounds of broken glass can be heard and smoke seen. It was not clear whether the journalist had been detained. ‘ABHORRENT’ The coup brought a halt to Myanmar’s tentative steps towards democracy after nearly 50 years of military rule, and has drawn condemnation from the United States and other Western countries, and growing concern among its neighbours. Foreign ministers from the Association of Southeast Asian Nations (ASEAN), of which Myanmar is a member, will hold a video meeting on Myanmar on Tuesday and listen to representatives of the Myanmar military, Singaporean Foreign Minister Vivian Balakrishnan said. Balakrishnan called for the security forces to desist from the use of lethal force, for Suu Kyi’s release, and for talks on solutions and a way back to democratic transition. Tom Andrews, a U.N. special rapporteur, said it was clear the junta’s assault would continue so the international community should ratchet up its response. He proposed a global arms embargo, more sanctions on those behind the coup and on military businesses and a U.N. Security Council referral to the International Criminal Court.