Congress general secretary Digvijaya Singh on Thursday tweeted ailing Shiv Sena chief Bal Thackeray has died but later retracted his remarks.
Singh later apologised to Thackeray´s family for his tweets.
"Sorry to hear about Bala Saheb´s sad demise. Never accepted his Political Ideology but admired his Wit and Courage of Conviction," Singh tweeted.
"My condolences to Udhav and Thakre Family," he said.
Singh retracted the comments immediately and tweeted: "My apologies to Thakre Family Pray for his speedy recovery."
Meanwhile, Shiv Sena leader Sanjay Raut said Thackeray is stable and he is responding to medicines.
"He is very much stable. He is a strong man and he will surely come back to us again in public," said Raut, a Rajya Sabha MP of Sena and the party´s spokesperson.
"He needs rest. He is not critical, he is responding to medicines," Raut said adding that Thackeray is much better on Thursday than he was a day ago.
He said the party has urged the Shiv Sainiks (party followers) to not to gather before his house.
Earlier, the leaves of all policemen in the city were cancelled as security was tightened outside ailing Thackeray´s house, said reports.
Rapid Action Force (RAF) personnel have been deployed outside Matoshree, Thackeray´s house in Bandra.
Bharatiya Janata Party (BJP) leader Gopinath Munde visited the 86-year-old leader on Thursday morning.
The ailing Thackeray continues to be critical and some reports, quoting doctors, say he is on life support.
The road to Matoshree has been barricaded.
At 2 am on Thursday, the 86-year-old´s son, Uddhav, came out and said: "I have not lost hope. You too must not lose hope. All efforts are on. Please pray and maintain calm."
Bollywood actor Amitabh Bachchan and his son Abhishek came to see Thackeray late on Wednesday night. Sanjay Dutt and his wife Manyata also came.
Earlier on Tuesday, dismissing reports of his serious health situation, Thackeray had urged people to ´throw out´ Congress governments both from the Centre and the state of Maharashtra.
"Throw out Congress and drive away the darkness forever," Thackeray said in a statement published in Sena mouthpiece ´Saamna´.
Thackeray made the comments a day after he dismissed reports that he was on ventilator support and said he has not collapsed completely.
He said his son and executive president of Shiv Sena Uddhav Thackeray was looking after him while his nephew and Maharashtra Navnirman Sena chief Raj Thackeray "keeps coming regularly".