Polish government Sunday launched a one-month ban on sales of strong alcohol imported from the Czech Republic after the country reported 20 deaths and 36 people in serious condition after consumption of bootleg spirits containing poisonous methanol.

"The Chief Health Inspectorate has issued a one-month ban on the sale in Poland of all alcoholic beverages from the Czech Republic with the exception of wine and beer," a Health Ministry statement said.

During the ban Polish health authorities will make extensive tests of Czech alcohol to ensure it is safe for consumption.

Methanol-laced legitimate-looking bottles have recently started appearing in regular liquor stores across several Czech regions, including Prague. Earlier this month Czech authorities banned liquor sales at outdoor markets after first intoxication cases were reported.