Customers look through empty shelves at a supermarket in Shanghai, March 30. Residents of Shanghai are struggling to get meat, rice and other food supplies under anti-coronavirus controls that confine most of its 25 million people in their homes, fueling frustration as the government tries to contain a spreading outbreak. AP-Yonhap

Residents of Shanghai are struggling to get meat, rice and other food supplies under anti-coronavirus controls that confine most of its 25 million people in their homes, fueling frustration as the government tries to contain a spreading outbreak.

People in China's business capital complain online grocers often are sold out. Some received government food packages of meat and vegetables for a few days. But with no word on when they will be allowed out, anxiety is rising.

Zhang Yu, 33, said her household of eight eats three meals a day but has cut back to noodles for lunch. They received no government supplies.

''It's not easy to keep this up,'' said Zhang, who starts shopping online at 7 a.m.

''We read on the news there is (food), but we just can't buy it,'' she said. ''As soon as you go to the grocery shopping app, it says today's orders are filled.''

The complaints are an embarrassment for the ruling Communist Party during a politically sensitive year when President Xi Jinping is expected to try to break with tradition and award himself a third five-year term as leader.

Shanghai highlights the soaring human and economic cost of China's ''zero-COVID'' strategy that aims to isolate every infected person.

On Thursday, the government reported 23,107 new cases nationwide, all but 1,323 of which had no symptoms. That included 19,989 in Shanghai, where only 329 had symptoms.

Complaints about food shortages began after Shanghai closed segments of the city on March 28.

Plans called for four-day closures of districts while residents were tested. That changed to an indefinite citywide shutdown after case numbers soared. Shoppers who got little warning stripped supermarket shelves.

City officials apologized publicly last week and promised to improve food supplies.

Officials say Shanghai, home of the world's busiest port and China's main stock exchange, has enough food. But a deputy mayor, Chen Tong, acknowledged Thursday getting it the ''last 100 meters'' to households is a challenge.

''Shanghai's battle against the epidemic has reached the most critical moment,'' Chen said at a news conference, according to state media. He said officials ''must go all out to get living supplies to the city's 25 million people.''

A delivery man passes by barriers set up to lock down a community in Shanghai, March 30. AP-Yonhap