The Manchester synagogue terrorist was being investigated for two alleged rapes before carrying out the atrocity, according to reports.
Greater Manchester Police (GMP) said Jihad al-Shamie, 35, was reported for allegedly raping a woman in December 2024.
He is then said to have raped another female victim, which was alerted to police a month before he launched a knife and car-ramming raid on Heaton Park Shul in Crumpsall.
As it transpired, al-Shamie was on bail after being arrested for one suspected rape at the time of the attack.
During the attack on October 2, al-Shamie called 999 to claim responsibility for the attack and pledge allegiance to Islamic State.
A GMP spokesman told the Manchester Evening News: "Further work is required to understand all the circumstances around the investigations and, as stated on Wednesday, this is currently subject to assessment by the Independent Office of Police Complaints.”
The force said he had a conviction for possession of Class B drugs in 201 and a penalty notice for shoplifting.
Neighbours of al-Shamie previously said they reported him to authorities in 2021 over fears he had been radicalised.
The IPOC is currently investigating GMP's contact with al-Shamie over the assault claims.
The watchdog has already cleared armed officers of wrongdoing after accidentally shooting dead worshipper Adrian Daulby, 53, and injuring Yoni Finlay.
Melvin Cravitz, 66, was murdered by al-Shamie and security guards Bernard Agyemang and Andrew Franks were wounded.
Meanwhile, GMP has denied that al-Shamie, a British citizen of Syrian descent who was eliminated by police during the attack, was known to counter-terror police or security services.
On Thursday, a man detained on suspicion of terror offences was re-arrested at Manchester Airport, the day after he had been released without charge. He remains in custody.
If you've been the victim of sexual assault, you can access help and resources via www.rapecrisis.org.uk or calling the national helpline on 0808 802 9999.
