Chinese authorities kill 20,000 birds as avian flu toll rises to 6

Story highlights

NEW: Authorities slaughter market birds in Shanghai after H7N9 found in pigeons

Poultry markets in Shanghai will close starting Saturday

Fourteen human cases of H7N9 have been reported in eastern China so far

No cases of human-to-human transmission virus have been confirmed

Hong Kong CNN  — 

Chinese authorities have killed more than 20,000 birds from a live-poultry trading zone in Shanghai after an unusual strain of bird flu that has so far killed six people in the country was found in pigeons on sale in the city, state-run media outlet Xinhua reported Friday.

Details of the slaughter of chickens, ducks, geese and pigeons