Bengaluru,  Karnataka police have intensified investigations into the drugs case involving Siddhanth Kapoor, the son of actor Shakti Kapoor.

Notices have been served to foreign and Indian models who participated in the rave party organised in a luxury Bengaluru hotel with Siddhanth Kapoor in connection with use and consumption of drugs.

According to police, 150 models and celebrities attended the rave party and notices have been issued to 40 foreign and Indian models. They have been asked to appear for the investigation within a week.

Six female models have already appeared for the investigations and got their statements recorded. The transactions and connections of models and celebrities are found to be suspicious and is being probed, sources say.

The probe has revealed that the foreign nationals who participated in the rave party were staying illegally in the country even after expiry of visa period.

The Rave party in which drugs were found was attended by many celebrities and models. The police are still investigating the source of drugs. Though CCTV footage is verified, the police are yet to locate the persons who dumped drugs near the dustbin.

On June 12, the Halasuru police of Bengaluru city conducted raids on a luxury hotel following a tip-off about a rave party where drugs are circulated.

The police had detailed 35 persons, including Siddhanth Kapoor -- also the brother of actress Shraddha Kapoor -- and conducted medical tests. The tests have confirmed consumption of drugs by six persons, including Kapoor.

Later, the accused were released on station bail. Siddhanth Kapoor had told police during the inquiry that someone had given him water and cigarettes laced with drugs. He had also told the investigators that he did not know about it.

Bhimashankar Guled DCP (East) had stated that Siddhanth Kapoor has not agreed that he had consumed drugs. "Kapoor is claiming that it was mixed in his drinks offered by someone and that he did not know about drugs. He said that he had come to Bengaluru 40 times and attended parties as DJ. This was the fourth time he had come to the hotel and was arrested," DCP Guled had said.

"We have taken a guest list and suspicious persons will be called for questioning," he had stated.

The police have sent the mobiles of the accused to the Forensic Science Laboratory for data retrieval. The police are investigating the nexus of Siddhanth Kapoor and others with drug peddling.

The police have also sent notice to the luxury hotel owner and organisers of the rave party. The event management company representatives are also called for investigations.

A case has been registered under IPC Sections 20 A, 22 B, 27 B. The police had arrested Akhil Soni, Business Manager of Mind Fire Solutions, Harjoth Singh, an industrialist, Hani, a digital marketing entrepreneur and Akhil, a photographer.

The police had taken 7 grams of MDMA crystals and 10 grams of Ganja into custody after conducting a raid on a rave party organised at the luxury hotel The Park in Bengaluru on June 12.