Actors Deepika Padukone and Sara Ali Khan flew back to Mumbai from Goa today, a day after they were summoned in a drug probe related to the Sushant Singh Rajput death investigation. Two more actors, Shraddha Kapoor and Rakul Preet Singh, have also been summoned by the Narcotics Control Bureau in the widening probe into drug allegations related to the film industry. Deepika Padukone has been summoned tomorrow and Sara Ali Khan and Shraddha Kapoor on Saturday. Rakul Preet Singh, who was to appear before the anti-drugs bureau today, will be questioned tomorrow.