New Delhi, Sep 11 (UNI) Former Railway Minister Lalu Prasad and his son Tejashwi Yadav has sought more time from the Central Bureau of Investigation to appear before it for questioning in connection with a case related to alleged irregularities in tender process of two hotels of Railways. Last week, the CBI had summoned both of them to come to CBI headquarters on September 11 and 12 for questioning. But Mr Prasad and Mr Yadav requested CBI to give more time after they were summoned to appear before it in connection with Railways corruption case, sources in the agency said here today. They said fresh dates would be issued by the CBI for the father and the son. On July 5, the probe agency had registered a case against Mr Prasad, wife Rabri Devi, son Tejashwi Yadav, Sarala Gupta (wife of Prem Chand Gupta, RJD leader), Vijay and Vinay Kocchar (both directors of Sujata Hotels Private Ltd, Delight Marketing Company Pvt Ltd, Lara Projects LLP) and PK Goel (former Managing Director of IRCTC) under section 120-B, r/w 420 IPC and Section 13 (2), r/w Section 13 (1) (d) of Prevention of Corruption Act after a preliminary inquiry was conducted on a complaint regarding alleged irregularities in the tender process. The CBI had also raided at 12 locations in Patna, Ranchi, Bhubaneshwar, Delhi and Gurugram in connection with the case.