PEKANBARU, Indonesia — Indonesian authorities have arrested eight farmers for setting illegal fires on Sumatra island to clear land after numerous blazes created a thick haze, choking parts of Indonesia, Singapore, and Malaysia, police said Tuesday.
The farmers were arrested Monday and Tuesday after being caught ‘‘red-handed,’’ said police spokesman Lieutenant Colonel Hermansyah. He did not say whether they were employed by some companies that have been accused of deliberately starting the fires.
About 1,100 residents were forced to flee Rantau Bais and Bangko Pusako villages in Riau province Tuesday as acrid smoke from nearby burning peat swamps and palm oil plantations made breathing difficult, Hermansyah said.
‘‘The smoke has hurt their throats and eyes,’’ said Hermansyah, who like many Indonesians uses one name. ‘‘Visibility there is really bad.’’
A day after apologizing to neighboring Singapore and Malaysia, President Susilo Bambang Yudhoyono of Indonesia deployed 2,000 additional personnel Tuesday to fight the fires, which have affected air quality and caused respiratory problems among some people. He has called for an investigation.
Indonesia’s environmental minister, Balthasar Kambuaya, told reporters Sunday that authorities were investigating eight plantation companies that may have started the fires.
Riau forestry official Ahmad Saeroji estimated the burned area was around 4,942 acres. Satellite pictures have detected about 200 fires on plantations in the area.
Authorities warned motorists and fishermen in parts of the province to stay home this week due to poor visibility from the haze. However, the National Disaster Mitigation Agency reported Tuesday that it was raining in the provincial capital of Pekanbaru and in several hot spots after the government deployed aircraft for cloud seeding.