Published: 2018-08-10 11:56:44 BdST
The case involving Weinstein brings to six the number under review by Los Angeles prosecutors.
District Attorney spokesman Greg Risling did not give details of the allegations or when the alleged assaults took place.
Representatives for Weinstein and Seagal did not immediately respond to requests for comment on Thursday.
Weinstein has been charged in New York with three cases of sexual assault. He has been accused by more than 70 women of sexual misconduct, including rape, but has denied ever having non-consensual sex with anyone.
The initial accusations against Weinstein in 2017 sparked the #MeToo social media movement that has seen many people publicly accuse men in business, politics and entertainment of sexual misconduct and many resigned as a result.
Seagal, 66, the star of 1980s movies like "Under Siege," was made a Russian citizen by President Vladimir Putin in 2016 and earlier this month was made a special representative for Russian-US humanitarian ties.
The claims involving Anderson, 47, were first reported by US media in July.
Show host Anthony Anderson speaks on stage at 9th NAACP Image Awards in Pasadena, California, US, Jan 15, 2018. Reuters
Representatives for Anderson said in a statement that authorities have not contacted him or his representatives about the matter.
"It's unfortunate that anyone can file a police report whether it is true or false," the statement said. "Anthony unequivocally disputes the claim."
Anderson was nominated last month for an Emmy award for his performance as the head of an African-American family in the comedy series "Black-ish."