The situation around the Apollo Hospital in Chennai's Greams Road remained tense on Sunday evening, after Tamil Nadu CM J Jayalalithaa suffered a cardiac arrest.
AIADMK party cadres who gathered at the hospital in hundreds, breached security barricades set up by the police and reached the main gate of the hospital.
The entire road was reportedly blocked, as hundreds took to the street.
The police erected several more barricades inside the main gate of the hospital to avoid further untoward incidents.
Following news of the cardiac arrest, the entire state of Tamil Nadu went on a high alert.
According to highly placed sources in the police department, the entire TN police force has been mobilized to prevent any untoward incident and maintain law and order.
Several key officers of TN government, ministers of the state and close aides of Jayalalithaa gathered at the hospital.
Meanwhile, Tamil Nadu Governor Vidyasagar Rao also returned to Chennai from Mumbai, and is expected to head to the Raj Bhavan or the Apollo Hospital.
Union Health Minister JP Nadda also spoke to hospital officials and enquired about Jayalalithaa's health.
President Pranab Mukherjee along with several other high profile political leaders tweeted and wished a speedy recovery for the AIADMK supremo.
Meanwhile, Apollo Hospitals in a statement said, "Jayalalithaa is on extracorporeal membrane heart assist device and is being treated by a team of expert doctors and critical care specialists."
The hospital also stated that Dr Richard Beale from London was consulted and he had "concurred with the line of treatment by out cardiologists & pulmonologists."
Supporters outside Apollo hospital in Chennai break down as they hear about TN CM Jayalalithaa's cardiac arrest this evening. pic.twitter.com/6Cb59Y06h6
— ANI (@ANI_news) December 4, 2016
Huge crowd seen outside Apollo hospital in Chennai where CM Jayalalithaa is admitted. TN CM suffered a cardiac arrest this evening pic.twitter.com/1ibjRBN5o3
— ANI (@ANI_news) December 4, 2016
LIVE: Policemen form a wall between jaya supporters and Apollo hospitals | Express pic.twitter.com/TJdXayRFJD
— New Indian Express (@NewIndianXpress) December 4, 2016
#JAYALALITHAA "critical"
— Akash Soni (@Akashtv1) December 4, 2016
What does this mean, supporters ask @ApolloHospitals
Break barricades@HHSidhu @Gotham3 @AIADMKOfficial pic.twitter.com/8ARG0jwRDo
This is what the road outside #Apollohospitals in #Chennai looks like at this hour. #jayalalithaa pic.twitter.com/xCYsyIs63o
— T S Sudhir (@Iamtssudhir) December 4, 2016