According to police, it appears to be a case of murder due to monetary and property dispute and they are searching for both the accused.
The six months include the three months already spent in detention. The NSA allows preventive detention for up to a year.
Khan had made inflammatory statements on December 12 last year during the protest near Bab e Syed Gate outside the Aligarh Muslim University in front of more than 600 students. The official also alleged that the Gorakhpur doctor had made objectionable comments against Union Home Minister Amit Shah.
Dr Kafeel Khan, whose name surfaced in the 2017 Gorakhpur encephalitis deaths case, has expressed gratitude to superstar Shah Rukh Khan for shedding light on the tragic incident through his blockbuster film Jawan.
This is the third arrest made by the STF in the case.
It is to be recalled that Dr Khan had challenged his suspension in connection with the death of several children due to alleged shortage of oxygen at a government hospital in Gorakhpur district.
Dr Bhupendra Sharma will now take over as the nodal officer of pediatric department.
The infants had died allegedly because of disruption in oxygen supply due to pending payments to the supplier, a charge stoutly refuted by the state government.
Doctor Kafeel Khan of Gorakhpur's BRD Medical College and Hospital, who had been suspended in 2017 after the death of 70 children due to lack of oxygen supply to the hospital, has been dismissed, a senior government official said in Lucknow on Thursday.
In Aligarh, District Magistrate Chandra Bhushan Singh told reporters that Kafeel Khan's speech at AMU was instrumental in triggering violent incidents at the university on December 13 and 15.
Dr Kafeel Khan and 80 others have been included in the list of history-sheeters in Gorakhpur district of Uttar Pradesh and they will be on the radar of police, officials said.
"Some facts were not taken into account by the probe committee of Principal Secretary (Stamp and Registration Department) Himanshu Kumar and the government is looking into them," Rajneesh Dubey, Principal Secretary, Medical Education, told mediapersons in Lucknow.
Dominic Xavier heaves a sigh of relief for Dr Kafeel Khan who has been languishing in Mathura jail since January.
'Because of the apprehension that I could be implicated in any other case by the Uttar Pradesh government, Congress General Secretary Priyanka Gandhi Vadra had helped me on humanitarian grounds'
'The administration was not ready for (my) release, but I have been released because of the prayers of people.'
If any party gives me a ticket I am ready, Khan said .
Khan has been in jail since January after he delivered the allegedly provocative speech at the AMU during the anti-Citizenship (Amendment) Act protests in December last year. He is lodged in Mathura jail.
Khan has been in jail since January 29 for allegedly delivering a provocative speech at the Aligarh Muslim University on December 10, 2019 during the anti-Citizenship (Amendment) Act protests.
Kafeel Khan's mother has demanded police protection for her family.
A bench headed by Chief Justice S A Bobde, which was hearing the Uttar Pradesh government's plea challenging the high court's September 1 verdict, said it is 'a good judgment'.
On July 31, 2019, the doctor was suspended for the second time while he was already under suspension for allegedly forcibly treating patients at the Bahraich District Hospital and criticising policies of the government.
He was suspended from Gorakhpur's BRD Medical College after several children died there in 2017, apparently due to the lack of oxygen cylinders at the government hospital.
'Dr Kafeel is being framed by the Yogi government because he talks about the BRD hospital all the time.'
Sources close to her said she would be staying for a few days in her Gurugram penthouse before shifting to central Delhi, where she has finalised a house.
'The CM was in Gorakhpur when this attempt to murder took place on my brother.' 'I waited for two days to see what action the police takes, but after 48 hours, the police has not even questioned Paswan.'
Khan, who was the nodal officer at the state-run hospital's paediatric department, had been hailed as a hero after he reportedly bought oxygen cylinders with his own money during the crisis.
In her letter to her husband Sajeesh, Lini expressed her pain and anguish that she could not see him again.
With the fresh arrest, all the nine persons named in the FIR have been sent to custody.
'An individual cannot fight the might of the State.'
However, chief medical officer Dr Ravindra Kumar, part of the panel, said that the deaths were not due to lack of oxygen.
'Through this one step, and more steps that follow, log judte jayenge (more people will come together); I'm sure of that.'
The government, every year, hides behind the mystery of the disease, linking it with litchis, and does not confess malnutrition as the prime cause, points out Mohammad Sajjad.
The protesting students clashed with cops after were they stopped at the varsity gate and prevented from carrying out their march.
'Indian secularism doesn't deserve a tombstone. It needs a new shrine,' argues Shekhar Gupta.
Despite repeated appeals from the police and the varsity authorities, the protesters refused to end their agitation. Police said the protesters did not have permission to march towards Parliament.