Large crowd has been holding a vigil outside Chennai's Apollo Hospital, where Tamil Nadu Chief Minister J Jayalalithaa has been admitted. The crowd swelled late on 4 December, after news of Jayalalithaa having suffered a cardiac arrest spread like wildfire.On 5 December, Apollo Hospitals released a statement confirming that the CM suffered a cardiac arrest and is being treated and monitored by a team of experts, including cardiologists, pulmonologist and the critical care specialists.

Many supporters were seen wailing and praying for the well-being of the Chief Minister. A heavy police force has been deployment outside the hospital to control the mammoth crowd.

Tamil Nadu Chief Minister J. Jayalalithaa has been put on extracorporeal membrane heart assist device by expert doctors and critical care specialists at Apollo Hospitals after she suffered a cardiac arrest on Sunday evening.

"Dr. Richard Beale, professor of intensive care medicine, from London was also consulted, and he has concurred with the line of treatment by our cardiologists pulmonologists," said Apollo Hospitals.

A Huge crowd gathered outside Apollo Hospital here after the news of Chief Minister J. Jayalalithaa having suffered a cardiac arrest broke on Sunday evening.

New Zealand Prime Minister John Key, on 5 December, announced his resignation, saying it was the right time to go after eight years in the job.

"This is the hardest decision I've ever made and I don't know what I'll do next," he told a news conference, adding that he had never seen himself as a career politician. Being leader of both the party and the country has been an incredible experience."

Italy's Prime Minister Matteo Renzi, on 5 December, announced that he would be stepping down after losing a referendum on constitutional reform.

"My experience of government finishes here," Renzi told a press conference after the No campaign won what he described as an "extraordinarily clear" victory in the referendum on which he had staked his future.

Interior Ministry projections suggested the No camp, led by the populist Five Star Movement, had won the referendum with the backing of 59.5% of those who voted. Nearly 70% of Italians entitled to vote yesterday cast their ballots, an exceptionally high turnout that reflected the high stakes and the intensity of the various issues involved.

The 12th International Oil and Gas Conference, PETROTECH-2016 was inaugurated by Prime Minister Narendra Modi in the national capital on 5 December.

The theme of the Conference is Hydrocarbons to fuel the future - Choices and Challenges.

The Petroleum and Natural Gas Ministry has said that the conference aims to explore areas of growth in petroleum technology, exploration, drilling, production and processing, refining and other related issues.