Beijing reported five new COVID-19 cases from midnight to 6 pm on Wednesday, with four of them employees of one cold storage company in Fangshan district, according to the municipal health authorities on Wednesday.

The fifth case, who lives together with one of those employees, also works in cold storage industry, said Liu Xiaofeng, deputy director of the Beijing Center for Disease Control and Prevention, at a news conference on Wednesday evening.

Delta variant was detected from samples, he said. All of the cases have been transferred to designated hospitals for medical treatment.

Since Beijing reported one locally transmitted case on Saturday, the infected cases have involved Haidian, Chaoyang, Fangshan and Fengtai districts by Wednesday in the current COVID-19 outbreak in the capital city.

The authority has released the tracks of the new cases and asked the residents who have been to those places during the same period to report to local communities as soon as possible.

Liu said residents should not leave Beijing before receiving nucleic acid testing results.