Mumbai: The health condition of Shiv Sena chief Bal Thackeray turned "very critical" on Wednesday night.
Thackeray, 86, is in a "very critical" condition, doctors treating the Sena leader told PTI.
As the news spread, several party workers assembled outside his residence, 'Matoshree', in suburban Bandra, where security has been stepped up.
Speaking outside the residence, Sena leader Ramdas Kadam said, "Doctors are trying their level best (to stabilise Thackeray's condition) and conducting some tests on him."
MNS chief Raj Thackeray and close family members have reached Matoshree, where the Sena leader resides with his son Uddhav. A number of Shiv Sena MPs, legislators and senior leaders are also at Thackeray's residence.
Thackeray, who is ailing for sometime, continues to be under constant medical supervision.
A team of doctors stationed inside 'Matoshree' with nursing staff has been taking care of the Sena patriarch, who is having breathing problems.
Last month, he could not attend his party's annual Dussehra rally in Mumbai, but addressed it through a video recorded message.
Actor Amitabh Bachchan, considered close to the Thackeray family, and his actor-son Abhishek have also reached 'Matoshree' to enquire about the Sena leader's health.
Several leaders, including former President Pratibha Patil, have visited Thackeray's residence over the past few days to enquire about his health.