Last Thursday, the former prime minister was wounded while leading his supporters in a protest march.
In the assault on his convoy, one person was killed and at least ten others were hurt.
The current prime minister, the interior minister, and an army commander are all being accused of planning to kill Mr. Khan. They all refute the accusation.
According to the former prime minister, police in Punjab province, the scene of the attack, demanded that he retract his mention of the army officer, a senior member of Pakistan’s ISI intelligence organisation, before they would look into his charge.
Imran Khan: Pakistan’s highest court instructs law enforcement to look into a shooting
The top judge in the nation asked police to explain why they had not launched a formal probe four days after the incident and gave them 24 hours to do so.
“The evidence might have been lost at the crime scene if the police hadn’t conducted their investigation. In this manner, the case’s evidence will be disputed and rejected in court “Umar Ata Bandial, Chief Justice, remarked.
After being shot at the protest march in Wazirabad, in the northeast, Mr. Khan, 70, has been recovering in the hospital.
Before a burst of gunfire is heard, video footage shows him and his supporters on a shipping container being hauled by a vehicle. Then, as others close to him try to hide him, Mr. Khan is seen ducking.
Despite the absence of charges, one suspect is still being held in prison.
After the shooting last week, the march on the capital, which was on its seventh day at the time of the attack, was put on hold. It is scheduled to resume on Tuesday.
Mr. Khan, who was removed from office in April following a no-confidence vote in parliament, has said he won’t join the group while he recovers from his wounds.
New elections, which must be held by the end of next year, are once again being demanded by him and his followers.
Pakistan is currently experiencing economic difficulty and the aftereffects of this summer’s terrible floods, in addition to political unrest.
The nation has a history of political violence, culminating in the 2007 murder of former prime minister Benazir Bhutto. Many people remembered how she was murdered after Mr. Khan was attacked.
The former cricketer-turned-politician, who still has strong public support, has been at odds with the Shehbaz Sharif-led administration for months.
In a case he claimed was politically motivated last month, the election commission barred him from holding public office.
