Mangan, June 1 -- The Teesta River's water level rose significantly on Sunday due to the heavy and continuous downpour in Sikkim.

The India Meteorological Department (IMD) issued a red alert for today in the State's Mangan district for heavy to very heavy rain in the region.

The MeT also issued an orange alert for Sikkim's Gyalshing, Namchi, Soreng, Gangtok and Pakyong for the next 24 hours.

Superintendent of Police (SP), Mangan district, Sonam Detchu Bhutia on Saturday said that rescue operations are underway for the second day to find the nine missing persons after a tourist vehicle carrying 11 people plunged nearly 1,000 feet into the Teesta River near Chubombu, Mangan district on May 29.

Speaking to ANI, SP Sonam Detchu Bhutia sai...