The government has also transferred Superintendent of Police D.K Rai after the Mayawati government earlier Monday ordered a state police probe into the incident, which has caused a nationwide uproar.
Two policemen from the station are on the run.
The body of the girl was found hanging from a tree Friday night inside the Nighasan police station premises in Lakhimpur-Kheri district, about 200 km from here.
Divisional Commissioner Prashant Trivedi and zonal Inspector General of Police Subesh Kumar Singh visited the place Monday.
'The three doctors - A.K. Agrawal, A.K. Sharma and S.P. Singh - who have been suspended, were involved in carrying out the first post-mortem examiantion and reported asphixiation (choking) as the cause of her death,' Trivedi told reporters.
'Prima facie the post-mortem examination report looked motivated and a fresh autopsy was ordered by a team of doctors from Lucknow. The second report has confirmed that strangulation was the cause of her death,' Trivedi added.
'The Lucknow team of doctors has clearly stated that the hymen of the minor girl was intact, therefore we believe that there was no rape,' he pointed out.
Image: Local people watch as officials and police personnel exhume the body of a 14-year-old girl, who was found hanging on the campus of a police station, for a fresh postmortem in Khiri on Monday.