According to Narendra Modi, the country's prime minister, those found responsible for a deadly rail accident in eastern India will face "severe punishment.".
The incident in Odisha state on Friday evening involving two passenger trains and a goods train resulted in at least 288 fatalities and 1,000 injuries.
Officials report that all trapped and hurt passengers have been rescued after the rescue operations were finished.
Mr. Modi visited the scene and described the incident as "painful.".
He also visited hospitalized disaster victims and vowed that his government would "turn no stone" in the care of those who were hurt.
The multi-train collision in the Balasore district, which has been called India's worst rail accident of the century, is still not fully understood.
Likewise, various accounts of the order of events have been presented.
According to officials, a number of the Coromandel Express's carriages that were traveling between Kolkata (formerly Calcutta) and Chennai (formerly Madras) derailed at around 19:00 (13:30 GMT) after colliding with a stopped goods train.
Many of its coaches wound up on the wrong track. The Howrah Superfast Express, a train running in the opposite direction from Yesvantpur to Howrah, collided with some derailed carriages.
"The force with which the trains collided has resulted in several coaches being crushed and mangled," Atul Karwal, chief of the National Disaster Response Force (NDRF) explained to the ANI news agency.
Announcing the conclusion of rescue efforts on Saturday, the railway ministry said work to restore the crash site had begun.
Sounds of ambulance sirens have been going off every 30 minutes outside the trauma centre in the SCB hospital in the city of Cuttack - where critically injured passengers have been wheeled in.
So far, close to 200 passengers from the train accident site have been brought in, and the numbers continue to rise.
The hospital is the largest in the state of Odisha but is still three hours' drive from the accident site.
The hospital staff - from junior doctors to nurses and ward boys - have been lined up and waiting in groups to assist patients as they are brought in. Wards have been expanded to handle the numbers coming in.
The constant sounds of whistles and announcements by hospital authorities interrupts the chaos.
Family members of the injured are waiting anxiously outside praying for their relatives' wellbeing. But many are still looking for their loved ones, not knowing their whereabouts.
There is a counter set up to assist people who cannot locate their family members. It is crowded, and the lists run long.
Some people met by the BBC ran from the accident site to nearby hospitals before coming to the facility in Cuttack - searching for their families who were on board the trains.
An investigation into the cause of the crash has been launched, although Education Minister Dharmendra Pradhan has blamed "technical reasons".
Survivors and eyewitnesses have described chaotic scenes and the heroic efforts of people from nearby villages to save trapped passengers.
Mukesh Pandit, who was trapped for half an hour before being rescued, told the BBC he heard a "thunderous sound" shortly before the carriage overturned.
"Four passengers who were travelling from my village have survived, but a lot of people are injured or still missing. A lot of people died in the coach I was travelling in," he added.
- June 1981: About 800 people die when seven of the nine coaches of an overcrowded train fall into a river during a cyclone.
- August 1995: At least 350 people are killed when two trains collide 200km (125 miles) from Delhi.
- August 1999: Two trains collide near Kolkata killing at least 285 people.
- October 2005: 77 people are killed when a train derails in the southern state of Andhra Pradesh.
- November 2016: Nearly 150 people are killed and an equal number are injured when 14 carriages of the Indore-Patna Express train derail near the city of Kanpur.
Residents of the neighbouring villages were among the first to reach the site of the accident and start the rescue operation.
India has one of the largest train networks in the world with millions of passengers using it daily, but a lot of the railway infrastructure needs improving.
Trains can get very packed at this time of year, with a growing number of people travelling during school holidays.
Both passenger trains involved in the crash were full and had many more people on the waiting list, according to passenger lists on the Indian rail ministry website reviewed by the BBC.
India's worst train disaster was in 1981, when an overcrowded passenger train was blown off the tracks and into a river during a cyclone in Bihar state, killing about 800 people.
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