Rehman was responding to queries regarding the mental health of Zahir Jaffer, the man accused of murdering Noor on Wednesday. Social media was rife with allegations that Jaffer was intoxicated when he was detained and that he had a long history of drug abuse.

"He may have had a past history [of drug use] but at least at this time he was completely in his senses," Rehman said.

He added that their findings so far showed that Jaffer was "completely aware of his actions."

Photos also appeared on social media of Jaffer tied in ropes, apparently before he was detained.

Rehman said they found Jaffer tied in ropes because he had tried to attack people after murdering Noor; these people had tied him before they arrived.

The police was not investigating his mental health but whether the act was justified or not — "which it completely wasn't," Rehman said.

Initial reports in the media said the young woman was shot and then "slaughtered."

However, Rehman said that while a gun was found on the premises, the medical report did not show a firearm injury.

He also said a resident called the police which quickly reached the house as they were" close by.

The police acted quickly, Rehman said, arresting Jaffer and collecting evidence at the crime scene.

Islamabad police also tweeted images from the house.

Rehman said Jaffer was in custody and was being questioned. He also said the domestic staff is also being questioned to determine how much they knew about the incident and whether they had any knowledge about a premeditated murder.

Anyone who knew the incident could lead to murder falls into "vicarious liability and criminal negligence" according to Rehman.

He also responded to queries surfacing on social media about Jaffer's family holding influence.

"Whenever someone's brutal murder is carried out then we shouldn't care about the financial position of the culprit even if they are the son of a very influential father," he said, adding they were basing their case on evidence and were confident they could secure a conviction.

The gruesome murder has shocked Pakistanis and social media users have taken to Twitter to continue to demand Justice for Noor.

There is also an online petition calling for a swift trial.