Thousands of angry protesters took to the streets to tell India's leader he was unwelcome in Kolkata on Saturday, in the latest rally against a citizenship law that critics say discriminates against Muslims.

At least 16 people were injured when a fire broke out in a coach of the underground rapid transit system in the eastern Indian city of Kolkata on Thursday, officials said.

An Indian tea vendor caught on video taking water from a train toilet before selling his drinks to passengers has been fined amid heightened concern in India over food safety.

Kolkata is one of the last places on earth where pulled rickshaws still feature in daily life, but Mohammad Maqbool Ansari is among a dying breed still eking a living from this back-breaking labour.

The trio of Bangladeshis incarcerated at Alipore Jail in Kolkata remain at large after pulling off the audacious prison break over the weekend.

Mother Teresa, who was proclaimed a saint by Pope Francis last September, was declared the co-patron saint of Roman Catholic Archdiocese of Calcutta in eastern India's Kolkata on Wednesday.

Twelve people have been arrested in eastern India for trafficking newborn babies, who were smuggled out of clinics in biscuit boxes, police said on Thursday.

Fed up with having to speak last, or not at all, at meetings of Indian regional leaders, the chief minister of West Bengal wants to ditch the state's first name so that she can get her say.

Myanmar was struck by a magnitude 6.9 quake on Wednesday, the US Geological Survey reported, with tremors in India and China sending residents rushing out into the streets.

Indian leader Narendra Modi said a fatal flyover collapse in Kolkata was "an act of fraud" and accused West Bengal Chief Minister Mamata Banerjee of corruption at a state election rally.

Indian police have arrested three employees of the construction firm building a flyover which collapsed in the eastern city of Kolkata, as the death toll rose to 26, a senior officer said Saturday.

Indian police said on Friday they have detained five staff at the company building a flyover that collapsed, killing at least 25 people, as hopes of finding more survivors faded.