Avenatti, who made his name nationally speaking out against misogyny and sexual abuse, was arrested Wednesday on suspicion of felony domestic violence after a report containing the allegations was filed on Tuesday, according to the Hollywood Reporter.
"This is an ongoing investigation and we will provide more details as they become available", the department wrote on Twitter.
'I have never been physically abusive in my life nor was I last night, ' the lawyer said on Wednesday.
'Further, she was not at Mr. Avenatti's apartment on the date that this alleged incident occurred.
However, following reports in United States media that the victim was Mr Avenatti's estranged wife, Lisa Storie-Avenatti, she released a statement through her lawyers to say the report was false.
However, Avenatti was reportedly taken into custody on Wednesday.
Investigators told TMZ that Avenatti kicked the woman out of his apartment on Tuesday, which was when the alleged incident took place.
Five minutes later, Avenatti showed up and ran into the building, chasing after her.
We can probably say definitively this is the end of Avenatti's political aspirations.
The president has repeatedly denied that he had the affair, but in August, Cohen told a federal court that Trump had personally directed him to make the payment.
Meanwhile, the Vermont Democratic Party has already announced the cancelation of events at which Avenatti was scheduled to speak this weekend.
The Washington Post's Felicia Sonmez contributed reporting.