Former prime minister Atal Bihari Vajpayee's condition is improving and he is being monitored by a team of doctors round-the-clock, sources at the AIIMS said today. The BJP stalwart continues to be in the ICU of the Cardio-thoracic Centre at the hospital. "Former Prime Minister Atal Bihari Vajpayee is stable. He continues to show improvement and is being monitored by the team of doctors," the All India Institute of Medical Sciences (AIIMS) said in a statement. AIIMS Director Randeep Guleria had, on Wednesday, said the 93-year-old leader was showing significant improvement and the doctors were hopeful of his full recovery in the next few days. Mr Vajpayee was admitted to the premier hospital on June 11 with a kidney tract infection, chest congestion and the urine output on the lower side. He was immediately evaluated by a team of doctors and put on injectable antibiotics. Mr Vajpayee, a diabetic, has one functional kidney. He had suffered a stroke in 2009 that had weakened his cognitive abilities. Subsequently, he had developed dementia. Political leaders, including Union minister Anupriya Patel, met the ailing leader at the hospital today. Prime Minister Narendra Modi, BJP chief Amit Shah, RSS chief Mohan Bhagwat, former prime ministers Manmohan Singh and H D Deve Gowda, Rajasthan Chief Minister Vasundhara Raje and Congress president Rahul Gandhi have visited Mr Vajpayee at the AIIMS over the past four days. Mr Vajpayee was thrice elected the prime minister between 1996 and 1999 and is the only non-Congress prime minister to complete the full term of five years, from 1999 to 2004. As his health deteriorated, he had slowly withdrawn himself from public life and was confined to his residence for years. The "duplicate keys" of Puri Jagannath temple's treasury have been found, prompting Puri collector Aravind Agarwal to say the recovery was a "miracle" of the Lord. Opposition political parties, however, sought to know as to what happened to the original keys. The Puri district administration, which came to know on April 4 that the keys of the temple treasury's inner chambers were missing, stumbled upon a brown sealed envelope containing the duplicate keys on Thursday. Four personnel, who were looking for the keys, found the brown envelope with "duplicate keys of Ratna Bhandar" written on it, Mr Agarwal told reporters. "The envelope was found in the locker of the district record room after five days of search, though the temple records said the keys had been kept in district treasury," he said. "It is a miracle. All of us engaged in the search felt the presence of the Lord yesterday. Having failed to get the keys despite frantic search, I had completely surrendered before the Lord seeking his blessings," the 2007-batch Indian Administrative Service officer said. The opposition BJP has stepped up attack on the Biju Janata Dal or BJD government holding Chief Minister Naveen Patnaik, an officer in the chief minister's office, the Puri district collector and newly appointed Shree Jagannath Temple Administration (SJTA) chief administrator PK Mohapatra responsible for the missing key episode. "All these people have been misleading the public. One day the collector says keys are missing and now he says that duplicate keys are found. Where is the original key? How did the key get into the record room?" Odisha BJP spokesman Pitambar Acharya told reporters in Puri. Senior BJP leader Bijay Mohapatra also demanded action against the Puri collector, saying, "Nobody knows duplicate keys of Ratna Bhandar ever existed." Odisha Congress chief Niranjan Patnaik alleged the state government was not serious about looking after the affairs of the 12th-century shrine. On these allegations, the IAS officer said, "I thank Lord Jagannath for the recovery of the keys. I am working with all dedication and I am also open to any inquiry." He said the district administration will hand over the keys to the SJTA and place details about the matter before the judici