In a major development in the drugs probe linked to Sushant Singh Rajput’s death, the Narcotics Control Bureau has issued summons to Bollywood stars Deepika Padukone, Shradha Kapoor, Sara Ali Khan and Rakul Preet Singh.

Shradha and Rakul Preet are set to appear before the NCB on Thursday, and Deepika Padukone on Friday. Sara Ali Khan has been asked to appear for questioning on Saturday.

Earlier, the NCB summoned Deepika Padukone’s manager Karishma Prakash. She has sought exemption from the investigation till September 25. According to NCB sources, some WhatsApp conversations purportedly discussing drugs were on the radar of the agency. Some of these chats were purportedly between Padukone's manager Karishma Prakash and one "D", they said.

The agency has so far arrested more than a dozen persons, including Sushant's girlfriend and actress Rhea Chakraborty and her brother Showik Chakraborty, in the case. Last week, Rakul had moved the Delhi High Court seeking to stop media reports from connecting her with the Rhea Chakraborty drug case.

Sushant's talent manager Jaya Saha was questioned by the NCB on Monday. Sushant was found dead at his home in Bandra on June 14. 

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