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The Chinese health authority has also scaled up testing and treatment for COVID-19 infections in border areas as the country faces a rising risk of imported cases.

Among foreign investment deals worth a total of 16 billion U.S. dollars inked in Shanghai earlier this week are investments from U.S. retail giant Walmart and Japanese convenient store giant Lawson.

Zhang stressed that in the process of implementation, Syria's sovereignty, territorial integrity and political independence should be fully respected.

The lab director also rejected theories that the lab had accidentally released a coronavirus it had harvested from bats for research purposes, saying the lab's biosecurity procedures were strictly enforced, Reuters said.

But there is a growing concern over a possible spike in the cases due to the relatively low number of tests. Nepal has enforced a week-long nationwide lockdown since March 24 to prevent the spread of infection.