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Mumbai, Jun 19: The Mumbai Police, probing the   case of alleged suicide of Bollywood actor Sushant Singh Rajput, has sent a letter to Yash Raj Films, seeking details of the contracts it had signed with him, an official said on Friday.

Rajput, 34, known for films like Kai Po Che!, MS Dhoni: The Untold Story, Chhichhore, was found hanging in his Bandra apartment on Sunday, sending shockwaves in the film industry and elsewhere.

"Police are investigating various angles, including that of professional rivalry, in the case," the official said. So far, Bandra police have recorded the statements of over 13 people, including Rajput's family members and close friends like actor Rhea Chakraborty and casting director Mukesh Chhabra.

 "Keeping in view the professional angle, police have started calling some prominent production houses for inquiry. As part of that, police on Thursday sent a letter to Yash Raj Films, seeking details of all the contracts it had signed with the deceased actor," a senior police officer said.

"We have also asked for the copies of the contracts that Yash Raj Films had signed with the actor," he added.

In the next few days, police may also call those people, who had played a role in signing of contracts between the actor and the production houses for their projects, the officer said.

 Rajput had worked in two Yash Raj Films movies - Shuddh Desi Romance (2013) directed by Maneesh Sharma and in director Dibakar Banerjee directed Detective Byomkesh Bakshy! (2015).

His third film with the banner was supposed to be Paani, directed by Shekhar Kapur. However, YRF had reportedly backed out of the project later.

Mumbai, Jun 3: Investigators will subject the cloth allegedly used by actor Sushant Singh Rajput to hang himself to "tensile strength" analysis to determine whether it can bear the weight similar to that of the filmstar, as part of probe into his death, an official said on Friday.

Rajput (34) was found hanging at his suburban Bandra residence on June 14.

According to the investigators, the actor ended his life by hanging himself from the ceiling using a green coloured night gown made of cotton.

No suicide note was found from the spot, the police had said then.

Besides viscera from the actors body, the police also sent the gown for chemical and forensic analysis at the Forensic Science Laboratory (FSL) in suburban Kalina, he said.

It will take at least three more days to get final forensic report, the official said.

To ascertain the exact cause of death, forensic experts will check pattern of ligature marks around the actors neck and also determine the strength of the gown with the help of "tensile strength" analysis, he said.

The tensile strength test will technically establish whether the cloth can bear around 80kg, the weight of the actor, he said.

The test will help determine if there was any foul play, the official said.

Tensile strength is maximum load that a material can support without fracture when being stretched.

Viscera analysis will help in checking whether there were any traces of chemical, poisonous or narcotics substance in his body, the official said.

"Usually, it takes eight to ten working days to get s report from the FSL in regular cases. But since this case is sensitive, experts are taking more precautions to avoid any kind of error in their analysis," the official said.

The forensic report of the actors mobile phone is also awaited, he said.

Recently, the police received the final post-mortem report of the actor from Cooper Hospital, which mentioned the cause of the death as asphyxia due to hanging"