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India has started stamping the hands of people feared to have coronavirus — quickly leading to the arrest of at least four people for breaking their quarantine.

“HOME QUARANTINED,” reads the hand stamp, along with the date it was given to determine when their 14-day isolation ends, according to a photograph in the Indian Express.

“Proud to protect Mumbaikars,” it also states, referring to citizens of the capital city, Mumbai, a densely packed metropolis of 18 million people.

The stamps started on Monday after the government of Maharashtra, the state that is not only home to Mumbai but has also been hit hardest by the nation’s at least 137 confirmed cases of COVID-19.

“Those who require self-quarantine but don’t want to stay in hospital or hotels and want to go home, they should have a sense of responsibility,” Chief Minister Uddhav Thackeray told the Indian Express of the stamps.

“They should not roam around freely. They should follow quarantine strictly,” he said.

The drastic measure comes as experts fear the nation of 1.3 billion could become the next global hotspot for the potentially deadly virus.

It has also led to the quick arrest of four people who were traveling on a train against their quarantine orders — with police alerted by fellow passengers who spotted their hand stamps, the paper said.

They got the hand stamps at Mumbai international airport after landing from Germany, and were supposed to be isolated because of the risk of having been to Europe, a COVID-19 hotspot, the report said.

They were taken to a government hospital and allowed to leave after being checked, the report said, with India TV saying they had tested negative but were still ordered to quarantine.

With Post wires