The Supreme Court today sought an explanation from the District Judge of Ghaziabad Vishnu Chandra Gupta for his alleged interference in the course of justice in the Uttar Pradesh provident fund scam case.A Bench comprising Justices D K Jain, V S Sirpurkar and G S Singhvi issued notice to Gupta seeking his response within four weeks.CBI filed an affidavit through Attorney General G E Vahanvati alleging that Gupta had on July 26 asked the district government counsel (DGC) of the local police to take back the CDs relating to the scam from the agency.However, when the CBI counsel protested, the judge orally told the DGC to plead themselves in the case as they have filed the main chargesheet in the matter and conduct the trial along with the investigating agency, the affidavit said.The apex court also issued notices to 70 accused on the plea of CBI seeking shifting of the trial of the case from a special CBI court in Ghaziabad to anywhere, preferably to the national capital.The chargesheet filed by the CBI had also named six district judges out of which three of them were elevated to the Allahabad High Court.The apex court had on July 28 stayed the proceedings in the PF scam before a special CBI court after the agency had submitted that some extremely disturbing incidents warranted shifting of the case outside the state.