Sushmita Pathak

Sometimes the call comes from a teenage girl.

She is pleading for help, "saying her parents are trying to get her married but she wants to stay in school," says Vijay Muttur.

He's the child protection officer in the town of Solapur in south-central India. After India went under a coronavirus lockdown in late March, his phone has been ringing off the hook. He's hearing from girls under the age of 18, from village elders, from social activists and child-care workers.

The world's biggest coronavirus lockdown has been extended for 19 more days.

India's 1.3 billion residents have been under lockdown for the past three weeks. Restrictions were set to expire at midnight Tuesday (2:30 p.m. ET). But in a televised address to the nation, Prime Minister Narendra Modi announced that Indians will have to stay home through May 3.

Under lockdown, well-off Indians isolate indoors, work from home and get groceries delivered.

But outside their windows, it's a different story: Poor laborers amass in the streets, hungry and homeless.

In a video posted on Twitter, a woman calls down to a crowd of people gathering below her window. They yell back up to her, desperate: "There are 400 of us here without food. We need help. There are lots of children."

With a fraction of the hospital beds and ventilators per capita of developed countries, Indian doctors and public health experts warn an explosion of coronavirus cases could overwhelm their hospitals on a greater scale than what's happening in Italy and the United States — and lead to many millions of deaths.

Updated at 9 a.m. ET

"America loves India, America respects India, and America will always be faithful and loyal friends to the Indian people," President Trump told a cheering crowd of more than 100,000 people in India's huge Motera cricket stadium on Monday.

"From this day on, India will always hold a very special place in our hearts," Trump said. He referred to his host, Indian Prime Minister Narendra Modi, as "a man I am proud to call my true friend."