Updated on Friday at 10:40 a.m.
Iram Sabah, mother of two, is terrified by messages her family has been receiving on their smartphones.
Her husband recently was forwarded a video that shows a child's mutilated body. It's unclear where or when the video is from, or whether it has been doctored. A voice implores people to forward it to others, and to stay vigilant — that kidnappers are on the loose.
Sabah, 27, doesn't know if the video is fake or real. But she's not taking any chances.
"When my children go outside to play, I'm really scared," she says in an interview at her home in western India. "These rumors have been spreading. I don't let them walk to school alone anymore."
Such videos and messages — many of them fake or photoshopped — have gone viral across India, spread mostly on WhatsApp, a messaging tool owned by Facebook. India is its largest market, with more than 200 million users.
The messages have driven parents like Sabah to keep their children indoors. Teachers report reduced attendance at schools. The texts have even driven some Indians to murder.
In recent months, about two dozen people across India have been lynched — beaten to death — by mobs driven to violence by what they've read on social media.
Fake news is blamed for misleading voters and possibly influencing elections in the West. But in India, it's killing people.
One night this month, around 11 p.m., Sabah heard a commotion outside her home. She lives in a midsize town, Malegaon, in northern Maharashtra state — an area famous for its textile looms, about 170 miles northeast and inland from India's largest city, Mumbai.
She was inside, having put her children, ages 4 and 6, to bed. Her husband was outside tinkering with his motorcycle.
"I saw a mob beating five people. The crowd was getting bigger and bigger. They filled up the road in front of my house," says Sabah's husband, Shaikh Wasim Shaikh Karim, 32. "They even attacked police vehicles."
The five victims at the center of the mob were a couple, their toddler and two relatives. They'd wandered into town to beg, police and witnesses said. Locals feared they were the kidnappers all these WhatsApp messages had warned of — and attacked them.
Shaikh Karim pulled the victims to safety inside his home, as the mob shattered his windows with stones. Police finally intervened and extracted them. But they're still in hiding, shaken.
Not everyone has been as lucky. In the neighboring district of Dhule, five other people were beaten to death under similar circumstances on July 1, the same day Shaikh Karim rescued people from the mob in front of his house in Malegaon.
Nationwide, Indian police have launched an anti-fake news campaign. Traffic cops hand out flyers at intersections, with information dispelling the latest smartphone rumors to go viral. Town hall meetings are being convened across the country.
At a rural school near Malegaon, police officers huddle in a humid cinder-block classroom, showing students one such misleading video on a tablet computer. Hundreds of villagers have gathered outside to hear the local police chief speak to the crowd. He urges them to be skeptical of what they read online.
"We made an appeal to the families, that they should not be fooled by false rumors and false pieces of news on the Internet," says Harssh Poddar, additional superintendent of the Malegaon police. "They must use their own minds. They must use their own sense of discretion — and in any case, it is not legitimate to attack someone on the belief of any rumor, fake or true."
The problem of mob justice in India isn't confined to poor people, or rural dwellers, or first-time smartphone users. One of the latest victims was an engineer for Google. In May, another man was killed under a highway flyover in Bangalore, a city of 12 million that has become India's high-tech hub — the local equivalent of Silicon Valley.
Many of the rumors circulating India prey on people's deepest fears, like having your child stolen. Some of the messages blame a rival religious, ethnic or tribal group — stirring a mistrust that already exists deep down in certain communities, Poddar says.
"I wouldn't say that when a mob behaves like this, that it is an incident of collective losing of mind. It isn't," he says. "It is an instance of knowing that you are shielded behind a crowd, that you may not be identified, and therefore you can indulge in behavior that is otherwise unacceptable in any civilized society."
In that way, mobs on the street could be acting similarly to trolls on the Internet — taking advantage of anonymity.
Poddar is trying to change that. He's used closed-circuit TV to identify attackers. He's threatening jail time to anyone who even forwards incendiary messages.
"We're launching a test to limit forwarding that will apply to everyone using WhatsApp," the company said on Thursday.
Inside India, another new feature will prevent users from forwarding messages to more than five people or groups at a time. The app will also remove a quick forward button next to media messages, it said.
"Right now the most important point is to tell people that WhatsApp is not your news source," says Pankaj Jain, who runs the Hoax Slayer website, devoted to debunking fake news online. "It's not a newspaper, it's not a news channel."
Jain says he receives 20 to 30 queries a day from the public, urging him to investigate rumors or suspicious videos online. He has debunked mermaid sightings, ghost cars and, increasingly in India, kidnapping videos. He traced some of the most incendiary footage to an unrelated incident in Guatemala, not India.
With smartphones and Web service getting cheaper and more ubiquitous in India, Jain says online rumors are multiplying. He predicts it'll grow even more next year.
"Whenever an election comes, the fake news starts spreading a lot," Jain says. "So obviously it's going to increase by 2019."
2019 — next year – is when India holds its general elections.
NPR Mumbai producer Sushmita Pathak contributed to this report.