Twelve children have died of a mysterious disease in Bihar's Muzaffarpur district after they complained of high fever and convulsion, officials said Wednesday.

"A total of 12 children have died over the past few days. In the last 48 hours, four children have died of the mysterious disease. Dozens of children have been admitted to different hospitals for treatment," civil surgeon A.P. Singh told IANS on phone from Muzaffarpur, about 70 km from here.