Deteriorating air quality means that all primary and secondary schools in Singapore will be closed on Friday due to the persistent haze caused by forest fires in neighbouring Indonesia. <br /><br /> Large parts of southeast Asia have been engulfed by the haze from the fires, said to have been set illegally to clear vegetation.<br /><br /> Indonesia has ordered four companies to suspend operations for allegedly causing the fires, an environment ministry official said on Tuesday.<br /><br /> Indonesia has launched investigations against more than 200 firms as it tries to bring the fires under control by the end of November, amid complaints from Singapore and Malaysia.<br /><br /> Thickening haze from Indonesia forest fires dampens Muslim, Chinese festivities in Singapore: http://t.co/1TTdnIe1SJ— The Associated Press (@AP) 24 Septembre 2015
