This is a key development which can further boost the speculations about the Grand Alliance in Bihar heading for a split. The JDU-RJD rift worsened on Saturday after Bihar Deputy Chief Minister Tejashwi Yadav did not attend a 'Vishwa Yuva Kaushal Divas' event as his name was mentioned on the invitation; but later removed. The event was attended by Chief Minister Nitish Kumar. Earlier in the day, the Janata Dal (United) said that party leader Nitish Kumar has not demanded the resignation of Deputy Chief Minister Tejashwi Yadav, who has been named in a First Information Report (FIR). The JD-U, however, demanded that Tejashwi should come out 'clean'. With regards to reports of an apparent rift in the RJD-JD (U) 'mahagathbandhan' or grand alliance, Tyagi re-iterated Lalu's stance on it, and said nothing will be done to harm their 'baby'. "The JD (U) and Nitish Kumar are the last people who will do anything to tamper with the mahagathbandhan. It is our baby, which was initiated by Nitish Kumar. There is no question at all of ending it," he said. Patna: Bihar Deputy CM Tejashwi Yadav will not attend a 'Vishwa Yuva Kaushal Divas' event. His name was mentioned in the invitation. pic.twitter.com\/dHLVgPffPH \u2014 ANI (@ANI_news) July 15, 2017 Patna: Bihar Deputy CM Tejashwi Yadav's name plate covered, later removed, in an event to be attended by CM Nitish Kumar. pic.twitter.com\/cmvbJkWzXf \u2014 ANI (@ANI_news) July 15, 2017 Speaking exclusively to ANI, Lalu had earlier stated that the grand alliance in Bihar is an unbreakable bond, adding that the RJD will not let the Bharatiya Janata Party (BJP) or the Rashtriya Swayamsevak Sangh (RSS) break the alliance between the JD (U), Congress and the RJD. It is being said that after the JD (U) urged Tejashwi Yadav to come out clean on the corruption charges imposed by the CBI and the ED and asked Lalu to declare his assets and reveal the source of income, the rift between the alliance partners in the state seemed to have widened, indicating that the alliance is inching towards a split. Earlier last week, the Central Bureau of Investigation (CBI) registered a corruption case against Lalu, his wife Rabri Devi, son Tejaswi; former Indian Railway Catering and Tourism Corporation (IRCTC) Managing Director P.K. Goyal; and the wife of Lalu's confidante Prem Chand Gupta, Sujata on allegations of awarding the tender for development, maintenance and operation of hotels in Ranchi and Puri in 2006. The CBI later questioned Rabri Devi and Tejaswi. However, Lalu on Friday said that his son Tejashwi Yadav, who is facing corruption charges, will not resign as Bihar Deputy Chief Minister. "The Vidhan Mandal of our party has taken a decision that Tejashwi Yadav will not resign," Lalu told ANI in an exclusive conversation. "An FIR is not sufficient reason for the resignation," he added. This assertion from the RJD chief thus brought an end to speculations that Tejaswi Yadav might step down from the post to save the ruling alliance.