"The police have found 12 outlets selling these products. About 30 kilograms [about 66 pounds] of cream puffs were removed from sale. A working group has been set up to find other outlets. An investigation is under way," a spokeswoman for the Chelyabinsk region police department told ITAR-Tass.
ITAR-Tass said 36 people, including eight children, were hospitalized with salmonella poisoning in Chelyabinsk, two in serious condition.
Local news sources said as many as 41 people have been sickened, ITAR-Tass reported.
"All these people ate cream puffs sold in a shop at the Kurchatovsky district bazaar. Measures are taken to find out the manufacturer of these cream puffs," a spokeswoman for the city's health department told ITAR-Tass.
An initial investigation into the source of the outbreak found the pastries were made by a company based in Kopeisk. Last year, more than 80 people became ill after eating products from the same company.
The name of the company was not reported.
Meanwhile, medical officials said the number of patients is likely rise, as the dormant period of the infection ranges from six hours to six days.