Singapore is prepared to prosecute any Indonesian companies found responsible for the fires that produced hazardous ash clouds last year, a minister said, standing his ground even as recent efforts to take firms to account drew ire from the country’s largest Southeast Asian neighbor.

Under the Transboundary Haze Pollution Act of 2014, Singapore has ordered six suppliers of Indonesia’s Asia Pulp and Paper Group to provide information on steps they are taking to prevent fires on their land, Environment and Water Resources Minister Masagos Zulkifli said in an interview…

The six companies have been told that Singapore has the right to bring their directors to court, and firms involved in haze-producing fires face fines of up to S$100,000 ($74,000) a day for every day of fire, the minister said…