Mala Lakhani, 50, who used to run a boutique in Green Park area, was murdered by a tailor who was employed with her since last three years.
Police are also scanning through profiles of missing girls and trying to identify the deceased, the DCP said.
The two victims have been identified as Asha Pathak and Usha Pathak, both were around 75 years of age, the police said.
Deputy Commissioner of Police (Northwest) Aslam Khan said the 16-year-old boy had entered a house to steal valuables, but was caught by the owner and beaten to death by some locals.
It is suspected that the killings were the fallout of a rivalry between two groups trying to assert their dominance in the area.
The injured have been admitted to the Max hospital, their condition is said to be critical.
According to the relatives and neighbours of the deceased family, the family had not disclosed of any financial or familial troubles. Sources close to the members also revealed that everything was fine and that they were happy.
The notes, found by police at the family house, have strong similarity with the manner in which the mouths, eyes etc of the deceased were tied and taped.
The police investigation has confirmed that the elderly lady was killed by asphyxiation, but cause of other deaths is yet to be confirmed.
The accused invited the Canadian national to his home where he sexually assaulted her.
Major Handa, who has been sent to four-day police custody by a Delhi court, wanted to marry the woman but she had spurned his proposal. Furious over the rejection, Major Handa, slit her throat in a car after an argument.
Shelja's body, lying on a secluded Delhi Cantonment road, was found by strangers at 1 pm on Saturday and within 24 hours Delhi Police arrested the key suspect from Meerut. Here's a look at the timeline of the Delhi Cantt murder case:
The police made the arrest as Major Handa, a friend of the victim, was spotted with her hours before she went missing from the Army Base Hospital in Delhi Cantonment area.
The police sources said that the accused, an Army Major, was a friend of the deceased and was seen with her hours before the murder. The available clues have made the police look for a love-affair angle, they added.
According to eyewitnesses, Kuldeep had come to the mall where the woman used to work at a shop. The woman was going to toilet on the first floor when the accused grabbed her and stabbed her several times.
According to official sources, the shooters and the victims could be part of two rivals gangs. The shooters were traveling in a Fortuner car while victims were in a Scorpio. The victims had also fired shots at the Fortuner during the incident, the sources said.
The victims, including four women, were allegedly surrounded and beaten up by a mob of 30-40 people on Thursday night. The victims alleged that they were targeted because they were Kashmiris.
Three killed over property dispute in Model Town.
Delhi: Three killed over property dispute in Model Town area. Police is investigating the matter.
The mother of the victim filed a police complaint after a neighbour alerted her about the circulating video, following which three men were arrested.
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