The fires forced schools to close, delayed and cancelled airline flights, disrupted shipping and forced Indonesians to don face masks. Cities affected include Pontianak, West Kalimantan, Palangkaraya, Central Kalimantan and Pekanbaru, Riau.[16][17] The haze was blamed for a Mandala Airlines flight from Balikpapan, the provincial capital of East Kalimantan, skidding off the runway upon landing at Tarakan on 3 October, when visibility was reported at around 400 metres.[18] It has caused breathing problems for people in Riau and in Jambi Province.[19] On 21 October 12 airlines cancelled domestic flights from Soekarno-Hatta International Airport due to smog at many destinations, including Jambi, Banjarmasin, Jayapura, Semarang, Surabaya, Bengkulu, Denpasar, Makassar, Pekanbaru and Padang.[20]