Shanghai allowed 4 million more people out of their homes Wednesday as anti-coronavirus controls that shut down China’s biggest city eased, while the International Monetary Fund cut its forecast of Chinese economic growth and warned that the global flow of industrial goods might be disrupted.

A total of nearly 12 million people in the city of 25 million are now allowed outdoors following the first round of easing of restrictions last week, health official Wu Ganyu told a news conference. Wu said the virus was “under effective control” for the first time in some parts of the city.

Under the latest changes, more than 4 million people are included in areas where the status shifted from “closed” to “controlled,” said Wu. He said some are not allowed to leave their neighborhoods, and large gatherings are prohibited.

Meanwhile, the IMF reduced its forecast of Chinese growth this year to 4.4% from 4.8% because of the shutdowns of Shanghai and other industrial centers. That is down by almost half from last year’s 8.1% growth and below the ruling Communist Party’s 5.5% target.

China’s case numbers in its latest infection surge are relatively low, but the ruling party is enforcing a “zero-tolerance” COVID strategy that has shut down major cities to contain even the smallest of outbreaks.

On Wednesday, the government reported 19,927 new cases on the Chinese mainland, all but 2,761 of which had no symptoms. Shanghai accounted for 95% of the total, or 18,902 cases, of which 2,495 had symptoms.