A fire that swept through a six-story building in the east Indian city of Kolkata killed at least 18 people early Wednesday morning, authorities said.

 India suffered its second huge, crippling power failure in two days Tuesday, depriving as much as half of the vast and populous country, or up to 600 million people, of electricity and disrupting transport networks.

The first power grid collapse, on Monday, was the country's worst blackout in a decade. It affected seven states in northern India that are home to more than 350 million people.

But Tuesday's failure was even larger, hitting eastern and northeastern areas as well.

Both blackouts cut power in the Indian capital, New Delhi.

The power companies that operate the affected electricity grids reported Tuesday's collapse on their websites.

With about 1.2 billion people, India has the second-highest population of any country, behind China.

[Updated at 1:07 p.m. ET] Investigators have arrested six hospital managers after a fire that killed at least 88 people in a hospital Friday in eastern India.

The six worked at a five-story hospital in the city of Kolkata, said Javed Ahmed Khan, the West Bengal Fire and Emergency Services minister.

They were arrested for negligence, Khan said.

A "majority" of the bed-ridden patients were abandoned by most of the staff on duty, he said.

Video of the scene broadcast by CNN affiliate CNN-IBN showed crowds of people wearing face masks and rushing patients out onto the street in stretchers.

[Updated at 2:06 p.m.]At least 32 people are dead and 40 are injured aftera residential building collapsed in the Indian capital Monday night, New Delhi fire-service chief R.C. Sharma told CNN.

About two dozen people could still be trapped, he said.

[Posted at 1:04 p.m.]At least 23 people were killed when a residential building collapsed in the Indian capital Monday night, authorities said.

Another 40 people were pulled from the rubble and taken to local hospitals, New Delhi's municipal spokesman Deep Mathur told CNN.

Video from the scene showed residents digging through the debris with help from construction equipment. Some men carried dust-covered victims to waiting vehicles.

The five-story building apparently collapsed because its foundations had weakened from seepage of rain water from this year's heavy monsoons. The fallen structure was situated closely to the Yamuna River that flows through New Delhi.

Mathur said rescue operations were still on, and fire officials estimated that as many as 20 people could still be trapped.

Delhi Chief Minister Sheila Dikshit expressed her sympathy for the families of the victims and promised to "inquire into the causes of the tragedy."

"I don't know if we can call it negligence ... it seems people were living comfortably there," Dikshit told CNN sister network CNN-IBN.

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Twenty-eight wedding guests were electrocuted Friday as an overhead cable came in contact with their bus in central India, police said.

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